This church is situated near the well known castle of the same name in the south-east part of the county, and about nine miles from Edinburgh. With the exception of the south aisle or chapel, the church (Fig. 1136) was entirely rebuilt about forty years ago.[103] To judge from what of the old plan can now be made out, the structure has originally been a Norman one, with aisleless nave and choir, and a circular eastern apse. The reconstruction of the edifice included that of the apse and the south wall of the chancel, which, although not entirely new, are yet practically so, none of the ancient architectural features being left, but only, at most, some of the walling. The apse is about 16 feet wide by about 10 feet 6 inches deep, and was lighted by three narrow widely splayed windows. The chancel was about 16 feet 6 inches long by 22 feet wide. The south wall contained two windows, and apparently a piscina, but all these features have disappeared, as well as the more important arches which formed the entrance to the chancel and the apse. A south aisle or chapel (see Fig. 1136) has been added to the church. It is entire and is a good example of Scottish Gothic of the latter half of the fifteenth century, having in all probability been built about the same time as the castle, the licence for the erection of which is dated 1430. William de Borthwick, a man of some eminence, was created Lord Borthwick shortly before that date, and the aisle is believed to have been erected by him. This aisle is vaulted with a pointed barrel vault, covered on the [Illustration: FIG. 1136.--St. Mungo’s Church. Plan.] outside with a stone roof (Fig. 1137), to resist the thrusts of which massive buttresses are provided. The roof consists of overlapping stone flags, carefully wrought, and the cornice at the wall head (Fig. 1138) is ornamented with carved heads and leaves alternately. The chapel contains in the south wall a recess for a monument, and the remains of two piscinas and a locker in the south and west walls. There is a small pointed window in [Illustration: FIG. 1137.--St. Mungo’s Church. South Aisle, from South-West.] the west side, and a larger one in the south end. The tracery of the latter is probably modern, as is the west doorway. The wide arch which [Illustration: FIG. 1138.--St. Mungo’s Church. Cornice of Aisle.] formerly opened into the church has been built up. A stately monument (Fig. 1139), containing two recumbent figures, is built against the east wall of the aisle. The statues are supposed to be those of the founder of the castle and the aisle, the first Lord Borthwick and his wife, who was a Douglas. The monument is not now in its original position. Before the time of the rebuilding it stood in the inside of the wall of the apse, and it was then removed and placed in its present position, where it has apparently suffered from [Illustration: FIG. 1139.--St. Mungo’s Church. Monument of Lord Borthwick and his Wife.]