One of the most remarkable churches in Wisby is that of the Helge-Anders (church of the Holy Ghost), founded originally, it is said, in 1046.[89] This, however, must refer to an earlier church, for the actual building[90] belongs to the transitional period both in its construction and in its details; it cannot, therefore, according to Mr. Haig, “have been erected earlier than at the beginning of the 13th century,” and this may apply only to the chancel, the north wall of which seems to indicate an earlier date than the rest of the building—in all probability about 1250 would be the date of the church, generally speaking. The nave is an octagon of about 48 by 45 ft., somewhat irregular in its setting out and owing to want of space was built in two storeys, both of which are vaulted, the vaults being carried by four octagonal piers on ground floor and circular piers on second floor in the vault of the lower storey there is an opening in the centre about 7 ft. in diameter, which is said to have been formerly filled with an iron grating. The chancel (which is square externally and internally, having a small apse and two small vestries) opens into both lower and upper church by semicircular arches, and thus serves for both. There was a third storey in the roof with stone gables on the east face of the octagon; the roof is gone, but it may have terminated as that of the church of Kallundborg (Woodcut No. 785). [Illustration: 788. Folö Church, Gothland. (From Marryat’s ‘One Year in Sweden.’)] The church most like this in Germany is perhaps that at Schwartz Rheindorf (Woodcuts Nos. 718 and 719). It also resembles the chapel at Landsberg (Woodcut No. 720); but the most extended and indeed the typical example of a church of this class is St. Gereon’s at Cologne (Woodcuts Nos. 740 and 741). The churches of St. Lars and St. Drotheus, the so-called sister churches (probably from the resemblance of their plans), belong probably to the 11th century, but the pointed work in them is evidently of a later period. About the same date, 1097, is given for St. Nicholas, the church of a Dominican convent, but the whole has been remodelled at a later period, the main arches of the nave rebuilt, and probably the whole church revaulted in the 13th century, at which period also the octagonal chancel was built. [Illustration: 789. Portal, Sandeo Church, Gothland. (From Marryat’s ‘One Year in Sweden.’)] The church of St. Katharine, belonging to the Franciscans or Grey Friars, was also wholly remodelled in the pointed period. It is said to have been founded in 1225. The choir, with its polygonal apse, was built in 1376-1391, and the piers and arches of the nave were rebuilt about the year 1400, the church being reconsecrated in 1412.