The sword Lobera was the symbol of power used by Saint Ferdinand III of Castile, instead of the more traditional rod, and so the king will be depicted with orb and sword in hand.
King Ferdinand III of Castile depicted with Lobera
Tales of Count Lucanor is a collection of parables written in 1335 by Juan Manuel, Prince of Villena. It is one of the earliest works of prose in Castilian Spanish.
Title page of the 1575 printing
Don Juan Manuel, the author of Tales of Count Lucanor