Just as the barrows, or grave hills, in Mainland, indicate by their peculiar size that in the heathen times the island was the chosen place of assembly for the mightiest men in the Orkneys and Shetland Isles, so also do the monuments of the early middle ages show that it continued to maintain its former pre-eminence after heathenism had ceased. Farthest towards the north-west, in the parish of Birsay, (Birgisherað), are to be seen considerable remains of the old castle, inhabited in the most ancient times by the jarls. Near the coast lies the Island of Brough (Burgh) of Birsay, on which also are seen traces of fortifications that have served to protect the jarls’ castle on the side of the sea. In the neighbourhood of this castle, Jarl Thorfin built a church, called Christ Church, in which both he and Jarl Magnus were buried. The latter, however, being afterwards canonized, his body was taken to Kirkwall. In the twelfth century, Bishop Wilhelm, the first bishop of the Orkneys, had his throne in this church. In Orphir (“Orfjara”), on the south coast of the island, was another castle where the jarls usually dwelt, until, together with the bishops, they fixed their abode at Kirkwall. This town, which lies close to an excellent harbour, and opposite the Island of Shapinsay, has for about seven hundred years been the capital of the Orkneys and the Shetland Isles. It seems, however, to have existed even earlier, as a village, or small trading place. Its name, “Kirkjuvágr” (“Kirkevaag,” _Eng._ Church-bay), since corrupted into Kirkwall, was derived from a church which stood there. The elevation of the town to be the residence of jarls and bishops took place in the twelfth century, after Jarl Ragnhild had built a large cathedral there, to which he caused to be conveyed the body of St. Magnus, the patron saint of the island, to whom the cathedral was consecrated. Thus the body of the saint effected for the town what its excellent harbour had not been able to accomplish. In the parish of St. Ola’, within the town, there was formerly also a church consecrated to St. Olaf, the patron saint of Norway, but it has long since been demolished.