Mio Cid

Play Rodrigo Díaz himself (1066 - directly playable from the Wandering Exiles screen with Roads to Power) and, in the wiki's own words, simply make the loyal choice each time one of The Song of El Cid story events fires. The chain runs across his whole life, so the real work is keeping the man alive and being patient. Pairs by design with Legacy of The Campeadores - the loyal ending on the way to Valencia.