Ansgarius (Moon)

Named after St. Ansgar Ansgarius - German theologian (801-864).

Ansgarius is a lunar impact crater that is located near the eastern limb. When viewed from the Earth, the crater has a highly oval shape due to foreshortening, but the rim is actually nearly circular. To the northwest is the crater La Pérouse, and south is Behaim. The rim is not significantly worn, and has a terraced interior surface. (wikipedia entry)

A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.