According to the older "Chronicon", Bero was the first bishop to be buried in Räntämäki, apparently in Koroinen, the semi-fortified episcopal residence near Turku along the Aura river. Archaeological excavations have revealed three episcopal graves from the church ruins, rather certainly belonging to Bero and his two successors that were all claimed to have been buried there. It is not known, when the see was moved to Koroinen, but Bishop Thomas is known to have worked in Nousiainen still in 1234. Some historians believe that the see was moved to Koroinen already before Bero, even as early as 1229, but that remains speculative.