"Þykkvabæjarklaustur (Thykkvabæjar Cloister) is a church site that was originally the location of a catholic monastery, founded in 1168, which remained active until the Reformation. Eysteinn Ásgrímsson, a monk at Thykkvabæjar Cloister in the 14th century, composed the poem “Lilja“, one of Iceland´s most famous medieval devotional poems. A pillar of columnar basalt has been erected where the monastery is believed to have stood." Katla Geopark