Councillors across Wales are being urged to fly Owain Glyndŵr's royal standard on Thursday.
Owain Glyndwr's standard will be flown in Cardiff Bay
This year marks the 600th anniversary of the rebel leader's crowning as Prince of Wales at Machynlleth.
But it appears so far that only Machynlleth, Aberystwyth and the Welsh assembly headquarters in Cardiff will fly his standard.
It flew above the assembly building for the first time last year on Owain Glyndŵr Day on 16 September.
But this year's celebration was particularly poignant, said Machynlleth county councillor Michael Williams.
"We've (Machynlleth) been flying the standard since July in celebration of the 600th anniversary of Owain Glyndŵr's crowning," he said.
"Machynlleth's historic links with Owain Glyndŵr's first parliament makes everyone in the town very proud.
"But this year's day is especially poignant and every council in Wales should give serious consideration to flying Glyndŵr's standard.
"It's up to the councils in Wales, but it would be nice for them all to recognise this special day."
Plaid Cymru culture spokesman Owen John Thomas made an official request to the presiding officer's office to make sure the standard flew over the assembly in Cardiff Bay.
"I am pleased the presiding officer has agreed to extend the precedent made last year," said the South Wales Central AM.
"And I hope this will continue and that other institutions will take note and emulate the action of the National Assembly."
Aberystwyth Town Council has also voted to fly the standard.
"Owain Glyndŵr is a national and an international hero - 600 years ago this year Glyndŵr held his first parliament in Machynlleth and captured Aberystwyth Castle," said Plaid Cymru councillor, Mabon ap Gwynfor, who proposed the motion.
"Aberystwyth was at the centre of the new Wales that Glyndŵr was trying to build, with a church and an university in Wales.
"He was a visionary who saw his nation's potential and had faith in her ability. He was centuries ahead of his time in terms of his vision for Wales.
"That should be celebrated. He had the support of community leaders and religious leaders in Wales, recognised as such at the time of his coronation, and he had the support of the King of France and the Pope of Avignon."
Celebrations have been taking place in Machynlleth since May to mark the 600th anniversary of Glyndŵr's crowning.
Does Wales do enough - or too much - to celebrate Owain Glyndwr? Below is a cross-section of your views:
When Glyndwr started the rebellion, Wales was under the Middle Ages version of the English jackboot. It was illegal for a Welshman to marry an Englishwoman, there were severe travel restrictions, the Welsh would be tried and executed by English lords on trumped-up charges and prejudice against the Welsh was openly encouraged. More should be done to remember such a national hero.
Peter Morris, The Hague, Holland
Celebrate your hertiage and those that helped to make it. Be thankful you can. It is a shame when you lose sight of your heritage. My grandfather came from Wales so I grew up on the stories of the country.
Theresa Katon, Jacksonville Beach, Florida, USA
Whether he was successful or not, he is a figure in our history and should therefore be remembered, along with the others. I agree with the notion that we should seek glory as a nation in what we do today, and therefore should be more positive and constructive about our new born democracy and our role as contributors to the global community.
Thomas, Cardiff, Wales
We don't do enough to celebrate our heroes or the culture of Wales. It is like we in Wales are ashamed to be Welsh. We might as well go and call ourselves England and be done with it.
Owain Glyndwr is, as a matter of fact, a historic figure of national and international importance. Everyone in Wales can celebrate the vision and achievements of his life. He tried to create a nation. This is still work in progress, but his vision of a united Wales with national institutions and a role in international affairs was streets ahead of many modern Welsh politicians!
Paul, Crymych, Pembrokeshire
It says a lot about this country when we celebrate a failure and a coward (running away from a battle to save his own neck).
Al Smith, Cardiff, Wales
Everyone should feel proud enough to participate in this event, I know I would if I had access to the standard. WWJ
Watcyn Wyn Jones, Saanichton, BC, Canada
Yes we should acknowledge the Parliament, the ambitions and visions for Wales, and the leader who never surrendered and was never betrayed. Jeff
Jeff, Leek, England
Glyndwr is a true hero of Wales, and is a modern day representation of our struggle. To those who say we should forget him as a barbarian, I say in that case that we end all commemoration of English royalty in Wales.
David, Charleston, SC USA
Why celebrate the life of a coward? After all, didn't he go into hiding in England instead of standing his ground and fighting? Of course Plaid Cymru will romanticise him, like him, they too are losers! It's a pity we don't honour the real life heroes here in Wales, and not some thug who lived 600 years ago. Let's not waste more money on statues, etc, we have squandered enough already on the assembly!!!
James Ryan, Cardiff
As a Scot, I think there's a place to celebrate Owain, because we celebrate Robert Burns night. But it shouldn't be hijacked by some national party like what has happened in Scotland. We should be proud of our past, but not let it get in the way of the present.
Horatio Nelson, William Wallace and James Connolly are all remembered in their countries for their vision, passion and sacrifice to the nations, so why shouldn't Owain Glyndŵr?
Arwyn, Wrecsam, Cymru
I am Welsh by accident of birth; why should I be proud of that? Furthermore I see absolutely no reason to celebrate a failure who lived 600 years ago. Did Wales regain independence? No. Glyndŵr's legacy is only relevant to the crackpots who fail to accept the reality of Wales in the 21st Century.
Matt, Cardiff, Wales
Owain Glyndŵr was a failed visionary. Unjustified revolution should never be promoted.
Ivan Smith, Swansea, Cymru
Glyndwr's vision was one of clarity. Self-determination, self-improvement and ultimately and land free of tyranny. He wanted to form centres of learning and form international ties - he was centuries ahead of his time. We should celebrate his efforts not only by flying his flag, but continuing his quest for a unified, free Wales.
Richard Martin, Pentyrch, Wales
We don't do enough to celebrate our culture in Wales. We should have national holidays on Saint David's Day and on the anniversary of Glyndŵr becoming Prince of Wales, rather than meaningless bank holidays.
Rhodri Howell, Cardiff
He is but a small-time Welsh rebel in a period of central instability in England. He did not demand the return of power to the people of the principality of Wales, but to claim that power to himself. A bloody medieval baron after more power for himself, not a visionary 21st Century pseudo-socialist leader as he is now portrayed. He was neither a Welsh Hereward the Wake or Robin Hood, more of a Mortimer or a De Monfort seizing the crown's power for himself. If Wales wants a real hero then either Llewellyn the Last, the last true Prince of Wales, or Pembrokeshire-born Henry Tudor, who ended the long period of bloodshed of the Wars of the Roses should be promoted. The Wars of the Roses was a conflict which Glyndŵr and the rest of the barony of England and Wales caused.
David Myles, Cardiff, UK
Glyndwr may have been a coward - we don't know today and anyone who claims today to know exactly what Glyndwr did is talking rubbish. But national figures are important and remind us of Wales's history before English domination. The traitors who use Glyndwr as a political weapon should not influence us. Fly his flag and our national flag and ignore the cowards who want to abolish Wales and make us all English.
Glyndwr should be as celebrated in Wales as Wallace is in Scotland. Isn't it about time his story was made into a film?
Ianto, Monmouth, UK
What is the difference between a freedom fighter and a terrorist? Is it political preference, historical epoch, royal / establishment connection, or the colour of one's skin?
Bryn Sadler, Cardiff
Owain's strength was his vision of a nation, and the capacity to share that vision with others. Welsh political leaders could do much to learn from his political genius.
Rev Gareth A Jones, Washington DC.
Anything that increases awareness of our own history is a good thing.
Patrick Daley, Cardiff, Wales
A nation that does not take pride in its history has no future. Of course we should honour people like Owain Glyndŵr, who should be recognised as someone who stood up against tyranny and oppression. The 16th of September should be a national holiday.
Glyn Davies, Pontypool, Wales
Owain Glyndŵr is not someone Wales should be proud of. Do we want some to remember someone who left his men on the slopes of Snowdonia to be massacred whilst he fled to protect his own neck?
Walk into any European city, and you'll find grand statues in their main squares of their famous past citizens. I don't think you can claim that enough has been done until our capital gives pride of place to Owain Glyndŵr.
Gwydion Gruffudd, Aberystwyth, Cymru / Wales
Of course he should be celebrated not only for what he had done for Wales but for Wales to remember and honor her own history.
Junko Salmon, Oklahoma, USA
I believe that Wales does not do enough to celebrate our heroes. I believe we should educate children across the country to learn more about their own army of heroes and less about English ones who have no relevance to us except in an academic context. Our youth have had enough of having English history rammed down their throats by a biased education system.
P Davies, Aberaeron Ceredigion
Every country should celebrate its heroes! Where I live flags are flown on every flag pole in the country on various days (in fact it's the law) to celebrate; the national poet, the national folk tales, mother's day, father's day, May day, veterans' day amongst others and of course independence day. It's a wonderful sight to see the people all united in a celebration of their nationality.
Jeff Rees, Karjaa, Finland