Lomello Baptistery of San Giovanni ad Fontes

Santa Maria Maggiore is a church in Lomello, province of Pavia, Lombardy, Italy, an example of First Romanesque art. It includes the oldest cross vaults in Italy. The oldest document mentioning the basilica is a privilege by pope Paschal II, dated 22 August 1107. Archaeological studies showed that at least two churches existed in the site before the current one, the earliest one being perhaps contemporary to the annexed baptistery of San Giovanni ad Fontes (c. 5th-7th centuries). The basilica has a nave and two aisles with a lower transept. The façade was originally embedded in the city's walls, but later the first three bays were abandoned and a new façade was obtained by closing one of the internal arches with a new wall. The nave is characterized by arches which, at the sides, have double mullioned windows at the sides. The pillars which do not support the arches are prolonged by blind columns up to the clerestory. The longitudinal arches (those separating the nave from the aisles) are supported by semicolumns which form the pillars. The aisles are a 14th-century reconstruction of the original ones. In 1944 a crypt, perhaps unfinished, was discovered. Adejacent to the basilica is the nearly coeval Baptistery of San Giovanni ad Fontes.

Lomello is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 50 km southwest of Milan and about 30 km west of Pavia, on the right bank of the Agogna. It gives its name to the surrounding area, the Lomellina. Lomello borders the following municipalities: Ferrera Erbognone, Galliavola, Mede, Ottobiano, San Giorgio di Lomellina, Semiana, Velezzo Lomellina, Villa Biscossi.

Galliavola is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 50 km southwest of Milan and about 30 km southwest of Pavia. As of 31 December 2004, it had a population of 230 and an area of 8.5 km².Galliavola borders the following municipalities: Ferrera Erbognone, Lomello, Pieve del Cairo, Villa Biscossi.

The Erbognone (also: Arbogna) is an Italian stream whose sources is south of Novara in the province of Novara.

Ottobiano is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 45 km (28 mi) southwest of Milan and about 25 km (16 mi) west of Pavia. As of 31 December 2004, it had a population of 1,168 and an area of 24.5 km2 (9.5 sq mi).Ottobiano borders the following municipalities: Ferrera Erbognone, Lomello, San Giorgio di Lomellina, Tromello, Valeggio.

Semiana is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 50 km southwest of Milan and about 35 km west of Pavia. As of 31 December 2004, it had a population of 256 and an area of 9.9 km².Semiana borders the following municipalities: Lomello, Mede, Sartirana Lomellina, Valle Lomellina, Velezzo Lomellina.

Mede is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 50 km southwest of Milan and about 35 km southwest of Pavia. As of 31 December 2004, it had a population of 6,993 and an area of 33.4 km2.Mede borders the following municipalities: Frascarolo, Gambarana, Lomello, Pieve del Cairo, Sartirana Lomellina, Semiana, Torre Beretti e Castellaro, Villa Biscossi.

Velezzo Lomellina is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 50 km southwest of Milan and about 35 km west of Pavia. As of 31 December 2004, it had a population of 113 and an area of 8.6 km².The municipality of Velezzo Lomellina contains the frazione (subdivision) Campalestro. Velezzo Lomellina borders the following municipalities: Cergnago, Lomello, Olevano di Lomellina, San Giorgio di Lomellina, Semiana, Valle Lomellina, Zeme.

San Giorgio di Lomellina is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 45 km southwest of Milan and about 30 km west of Pavia. As of 31 December 2004, it had a population of 1,196 and an area of 25.9 km².San Giorgio di Lomellina borders the following municipalities: Cergnago, Lomello, Ottobiano, Tromello, Velezzo Lomellina.

Cergnago is a comune (municipality) in the Province of Pavia in the Italian region Lombardy, located about 45 km southwest of Milan and about 30 km west of Pavia. As of 1 January 2018, it had a population of 719 and an area of 13.6 km².Cergnago borders the following municipalities: Mortara, Olevano di Lomellina, San Giorgio di Lomellina, Tromello, Velezzo Lomellina.

Pieve del Cairo is a comune (municipality) in the Province of Pavia in the Italian region of Lombardy, located about 60 km southwest of Milan and about 30 km southwest of Pavia. As of 31 December 2004, it had a population of 2,179 and an area of 25.5 km2.Pieve del Cairo borders the municipalities of Ferrera Erbognone, Galliavola, Gambarana, Isola Sant'Antonio, Mede, Mezzana Bigli, and Villa Biscossi.

Agra is a town and comune located in the province of Varese, in the Lombardy region of northern Italy.