 Shortly before Agilulf's death in 616, he named Theodelinda co-regent for their son Adaloald and once he reached maturity, she remained co-ruler over the kingdom.For a period of some thirty-five years Theudelinda was queen of the Lombards.Perhaps to further exhibit her faith, she constructed a Catholic cathedral dedicated to St. John the Baptist at Monza (near Milan) and richly endowed it.