The monastery at Kildonan was founded by a missionary St. Donnan, possibly from either Dal Riata or an Irish Kingdom. He and his monks were massacred in 617 by the local Pictish queen. In medieval times the island was held by Clan Donald. The church which currently houses the alleged sheela sculpture is thought to be a 16th century construction but there is evidence of earlier religious settlement in four cross slabs which date from the early medieval period. Records also list a religous settlement here in 725 so it would seem that the monastery continued after St Donan’s death.
References:House of the Blackheads (Melngalvju nams) is a building situated in the old town of Riga. The original building was erected during the first third of the 14th century for the Brotherhood of Blackheads, a guild for unmarried German merchants in Riga. Major works were done in the years 1580 and 1886, adding most of the ornaments.
The structure was bombed to a ruin by the Germans June 28, 1941 and the remains demolished by the Soviets in 1948. The current reconstruction was erected from 1995 to 1999. Today the House of Blackheads serves as a museum and sometimes concert hall.