Catherine II of Valois, Princess of Achaea

Catherine II, also Catherine of Valois or Catherine of Taranto (before 15 April 1303 – October 1346), was the recognised Latin Empress of Constantinople from 1307–1346, although she lived in exile and only had authority over Crusader States in Greece. She was Princess consort of Achaea and Taranto, and also regent of Achaea from 1332–1341, and Governor of Cephalonia from 1341–1346.

She was born in 1303, sometime before 15 April, the eldest daughter of Charles, count of Valois, and Catherine I.

Her mother was recognized as Empress of the Latin Empire of Constantinople by the Latin states in Greece, despite the city having been captured by the Empire of Nicaea in 1261. Catherine inherited her claims as the titular Empress on 11 October 1307. She was still a child and remained in the custody of her father, who managed her claims to the empire until his death in 1325.

An early betrothal to Hugh of Burgundy, made on 15 April 1303 when she was an infant, was renounced in 1312.

In July 1313, Catherine married Philip I of Taranto, King of Albania and Prince of Achaea, who was the younger brother of Robert, King of Naples. She associated her husband as titular Emperor (Philip II), and retained the claim to the empire after his death on 23 December 1332. Robert, his eldest surviving son, succeeded him as Prince of Taranto in 1331. Catherine became influential at the court of Naples.

Her court was more worldly than the pious court of King Robert and his pious wife, Sancha of Majorca. During the reign of her niece, Joanna I of Naples, she opposed the marriage of Joan's younger sister, Maria of Calabria, to Charles, Duke of Durazzo. This was because Maria was heir presumptive to the throne of Naples, and the Durazzos were rivals to her own family. She and her family were compensated with a cash settlement from the royal treasury.

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