Christian tradition contains many stories that do not come from canonical Christian texts yet still illustrate Christian themes. These non-canonical Christian myths include legends, folktales, and elaborations on canonical Christian mythology. Christian tradition has produced a rich body of legends that were never incorporated into the official scriptures. Legends were a staple of medieval literature. Examples include hagiographies such as the stories of Saint George or Saint Valentine. A case in point is the historical and canonized Brendan of Clonfort, a 6th-century Irish churchman and founder of abbeys. Round his authentic figure was woven a tissue that is arguably legendary rather than historical: the "Navigatio" or "Journey of Brendan". The legend discusses mythic events in the sense of supernatural encounters. In this narrative, Brendan and his shipmates encounter sea monsters, a paradisal island and a floating ice islands and a rock island inhabited by a holy hermit: literal-minded devotés still seek to identify "Brendan's islands" in actual geography. This voyage was recreated by Tim Severin, suggesting that whales, icebergs and Rockall were encountered.