Cid,
the (born Rodrigo, or Ruy, Díaz de Bivar) 1040?-99; Sp. soldier & celebrated hero, esp. in Sp. literature
Origin:
Sp < Ar sayyid, a lord
Brit. Criminal Investigation Department
See Cid in American Heritage Dictionary 4
Spanish soldier and national hero whose military exploits, including the capture of Valencia (1094), are recounted in several literary works, most notably the epic The Song of the Cid.