[Lat. Albingaunum; Albium Ingaunum; Album Ingaunum]
Italian town and bishopric, 72 km south-west of Genoa. It was a port in the Roman period, and its street grid-plan has partly survived, but, with the silting of the River Centa, it is now 1 km inland. Pottery and sections of the hull of a merchant ship that sank offshore c. 80–60 bc are preserved in the Museo Navale Romano in the Palazzo Peloso-Cepolla (13th century). The Civico Museo Inguano is housed in the Palazzo Vecchio del Comune (1387 and 1421). The cathedral, which was built in the 11th century and enlarged in the early 14th century, has a galleried apse and a campanile built in 1391.
The most important monument, however, is the 5th-century baptistery. Its ground-plan is decagonal without and octagonal within, the alternating rectangular and semicircular niches being flanked by columns. The original cupola was destroyed in the 19th century. The edge of the octagonal font at the centre of the hall has starlike points and was surmounted by a baldacchino. The only mosaics that survive are on the front wall of the building and on the vaulting of the presbytery niche. Although the latter has been heavily restored, it can be dated to the 5th century. At the centre of the vault is a christogram comprising the letters A and ...