Brendan and the Island That Was a Whale joins the Little Lamps shelf of saints' bedtime stories. It runs about eight minutes aloud and is text only, because the committed audio is over the size cap.
What is history and what is legend. The outline of Brendan's life (a sixth-century Irish abbot, founder of Clonfert, remembered as a traveller by sea) is from the early Irish tradition. The whale, the Easter on its back and the island of singing birds come from the Navigatio Sancti Brendani, a Latin text probably of the ninth or tenth century, and the story says so in the telling and again in the note for grown-ups. The feast day is 16 May, and he is in the Roman Martyrology rather than the General Roman Calendar.
Limits. Written by an AI, not an official Church text, and the prayer is not an approved one. The dates are traditional and approximate.