In 1544 Dunoon Castle was besieged by Matthew Stewart, 4th Earl of Lennox.
 Having eighteen ships and 800 soldiers provided by Henry VIII of England, Lennox succeeded in taking the Castles of Dunoon and Rothesay.
Archibald Campbell, 4th Earl of Argyll, was driven out, sustaining great loss.

In 1563, Mary, Queen of Scots, stayed at the castle while visiting her half-sister,  Jean 
Stewart, Countess of Argyll, and granted several charters during her visit.
In 1544 Dunoon Castle was besieged by Matthew Stewart, 4th Earl of Lennox.  Having eighteen ships and 800 soldiers provided by Henry VIII of England, Lennox succeeded in taking the Castles of Dunoon and Rothesay. Archibald Campbell, 4th Earl of Argyll, was driven out, sustaining great loss.
In 1563, Mary, Queen of Scots, stayed at the castle while visiting her half-sister,  Jean 
Stewart, Countess of Argyll, and granted several charters during her visit.
Dunoon Castle