 Lasuén was born at Vitoria in Álava, Spain on July 7, 1736 and joined the Franciscan order as a teenager, entering the Friary of San Francisco shortly before his fifteenth birthday on March 19, 1751.On March 19, 1751, Lasuén was ceremoniously invested with his Franciscan habit.In 1759, Lasuén left the Franciscan Sanctuary of Arantzazu (Gipuzkoa).