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In page Maria of Calabria:

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Shortly after her second husband's death, Maria was again imprisoned, this time by her brother-in-law himself, Louis of Taranto, and was released only after her marriage in April 1355 to Philip II of Taranto, the younger brother of Louis. Maria and Philip had three sons who died young: Philip (1356), Charles (1358), and Philip (1360). They also had two stillborn sons, in 1362 and in 1366.[citation needed][1] In 1364, Philip succeeded as titular Latin Emperor of Constantinople and Prince of Achaea and Taranto on the death of his oldest brother, Robert II of Taranto, Emperor of Constantinople.