Both of the first two flags belong to Lord Robert Keith, Master of Marischal who was born in 1483 in Scotland. He married Lady Elizabeth Douglas some time before January 8 1505.
Lord Keith was involved in the Battle of Flodden, in 1513. There seems to be a little confusion as to whether or not he was killed at the battle.
I think you can all guess the third flag!
The last flag is for William Graham, Earl of Montrose, He accompanied James IV on his invasion of England in 1513 and was killed at the Battle of Flodden on 9 September 1513, together with his brother, George Graham of Callendar, and his brother-in-law, Sir William Edmonstone of Duntreath.