The Duke of Gloucester who is president of the Institute of Advanced Motorists has been banned from driving for six months for speeding.
The offence is the Duke's fourth in three years
The Duke admitted doing 70mph in a 60mph zone in August on the A47 at Thorney, Cambridgeshire.
A cousin of the Queen, the Duke, who lives in Kensington Palace in London, was also fined £60 and ordered to pay £35 costs.
An Institute spokesman said they would be "taking advice" about his position.
"This is uncharted territory for us really. We are just taking a little bit of advice," said the spokesman.
"Normally somebody who has a 12-point totting up offence loses their licence automatically as well as their membership."
Flynn Jennings, prosecuting, told the court that the Duke's Ford car had been travelling at 70mph on a stretch of road with a 60mph speed limit.
The court clerk told magistrates that the offence was the Duke's fourth in three years.
She said three points had been added to his licence for speeding in November 2001, three for speeding in December 2002 and three for speeding in January