Born during the Renaissance, Baltasar de León was a humble knight-errant of modest noble lineage from Castile. Raised on the chivalric tales of heroic knights like El Cid, Baltasar dedicated himself to virtuous pursuits like wisdom, glory and honor while forsaking material riches.
In his quest, he roamed the country in a life of humble service, protecting the weak, righting wrongs and aiding the poor. Over many years, the injustices at the hands of the Inquisition he bore witness to weighed heavily on his soul.
In his many travels, he eventually met with members of the Brotherhood who introduced him to the Assassin's Creed. Seeing the similarities between his beliefs and their own, Baltasar joined the Order and swore to fight against the injustices committed by Torquemada and his Dogs of the Lord.