An historian says Liverpool should extend its apology over the flooding of Welsh villages for water supplies.
The campaign for Tryweryn was strong - unlike that for Llanwddyn
The city is already poised to say sorry for drowning Tryweryn, near Bala in Gwynedd, in 1965 to create a reservoir.
But Owen Roberts of Aberystwyth University told BBC Radio Cymru that it should also apologise for flooding Llanwddyn in north Powys in the 1880s.
The city council, which will put the apology to councillors on Wednesday, said it would consider it.
The flooding of Tryweryn created huge controversy after it displaced the Welsh-speaking community of Capel Celyn.
There were demonstrations and bomb attacks on building equipment at the site, and it is held to have led to a growth in nationalism and demand for devolution to Wales.
As it stands, the apology will voice the city's remorse for the fate of Tryweryn and for the way the issue was handled.
The village of Capel Celyn now lies at the bottom of the reservoir
Dr Roberts told Radio Cymru's Llinyn Mesur programme that another apology was due over the fate of Llanwddyn.
He said much less fuss was made about Llanwddyn at the time, as there were fewer nationalist politicians and pressure group, and those affected received much less compensation as a result.
Llanwddyn's parish church, two chapels, three inns, 10 farmhouses, and 37 houses were lost under the water.
"You could argue that the drowning of Capel Celyn has had more sympathy because there were many more nationalist politicians about in the 50s and 60s in Wales than at the end of the previous century," he said.
"It would be interesting to see what Liverpool would say... you could argue that they should apologise more to those in Llanwddyn than those in Capel Celyn - they received much less compensation than those in Tryweryn."
The city council said Dr Roberts' "comments will be taken on board and considered."
"If there are people in Wales who feel that things should be added to the motion (on Tryweryn) then the council will consider that," the council added.