Catherine I of Courtenay (25 November1274 – 1307/1308) was Titular Empress of Constantinople from 1283 to her death in 1307/8.
She was the daughter of the Titular Emperor of Constantinople Philip I of Courtenay
by Beatrice of Sicily
. Her maternal grandparents were King Charles I of Sicily
and Countess Beatrice of Provence
. The senior Beatrice was the fourth daughter of Ramon Berenguer IV, Count of Provence
and Beatrice of Savoy
On her father's death in 1283, Catherine inherited his claims to the throne of Constaninople and was recognized as empress by the Latin states in Greece. On February 8, 1301, she married Count Charles of Valois, son of King Philip III of France and Isabella of Aragon. Charles became titular emperor with Catherine until her death in January 1307 or 1308.
By Charles of Valois, Catherine I had four children:
- Peter Lock, The Franks in the Aegean 1204–1500, New York, 1995.