alcaide
noun
al·cai·de al-ˈkī-dē 
variants or alcayde
: a commander of a castle or fortress (as among Spaniards, Portuguese, or Moors)
Word History
Etymology
borrowed from Spanish alcaide, borrowed from Arabic al-qāʼid, from al "the" + qāʼid "leader, commander," noun derivative from active participle of qāda "to lead"
First Known Use
circa 1503, in the meaning defined above