structural:expansion, structural:reformatting
Etymology: Cid and Campeador

Rodrigo Díaz was recognized with the honorary title of "Campeador" during his lifetime, as is evidenced by a document that he signed in 1098, which he signed in the Latinized expression, ego Rudericus Campidoctor. The title "Campeador" thus comes from the Latin Campidoctor, literally meaning "Teacher of the Field", but translatable as "Master of the Battlefield". Arabic sources from the late 11th century and early 12th century call him الكنبيطور (al-Kanbīṭūr), القنبيطور (al-Qanbīṭūr), also preceded by Rudrīq or Ludrīq, which are Arabized forms of his title and name, respectively.

The epithet of "El Cid" meant "the Lord", probably from the original Arabic (Arabic: السَّيِّد, romanized: as- Sayyid), and was a title given to other Christian leaders. It has been conjectured that Rodrigo Díaz received the honorific title and respectful treatment of contemporaries in Zaragoza because of his victories in the service of the King of the Taifa of Zaragoza between 1081 and 1086; however, he more likely received the epithet after his conquest of Valencia in 1094. This title appears for the first time, as Meo Çidi, in the Poema de Almería, composed between 1147 and 1149.

The combination of "Cid Campeador" is documented from 1195 in Linaje de Rodrigo Díaz (The Lineage of Rodrigo Díaz) in Navarro-Aragonese which form part of the Liber regum written as mio Cit el Campiador; and in El Cantar de mio Cid.