After the conquest, Henry IV of Castile assumed the additional title of King of Gibraltar, establishing it as part of the ''comarca'' of the Campo Llano de Gibraltar. Six years later, Gibraltar was restored to the Duke of Medina Sidonia, who sold it in 1474 to a group of 4,350 ''conversos'' (Christian converts from Judaism) from Cordova and Seville and in exchange for maintaining the garrison of the town for two years, after which time they were expelled, returning to their home towns or moving on to other parts of Spain. In 1501, Gibraltar passed back to the Spanish Crown, and Isabella I of Castile issued a Royal Warrant granting Gibraltar the coat of arms that it still uses.