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However, through his marriage to Blanche, John of Gaunt became Earl of Lancaster, Earl of Derby, Earl of Lincoln and Earl of Leicester (although Gaunt did not receive all of these titles until the death of Blanche's older sister, Maud, in 1362).
Philippa of Lancaster, the eldest daughter of John of Gaunt, 1st Duke of Lancaster, and Blanche of Lancaster, was born in nearby Leicester Castle and was a Queen consort of Portugal, married in 1387 to King John I of Portugal during Anglo-Portuguese Alliance thus giving rise to extended name of the church (St. Mary de Castro) during one of its alterations.
In April 1372, custody of both Thomas and his elder brother, John, was granted to Blanche Wake, a sister of their grandmother, Joan of Lancaster.