Town of the central Lomellina area, in the province of Pavia, Laumellum was an important Roman settlement. The town's name appears to refer to the ancient population of Levi, founders of Pavia along with the Marici. The first historical documents that report evidence of the existence of this village date back to the I century B.C. when a "mansio" (a stop over station) was built here along the Via Regina, an antique road which already connected Pavia to the Gallia. Its location on the road to Pavia, increased its importance and under the Lombard reign, the Queen Teodolinda and the Duke Agilulfo celebrated here their wedding in 590. The fall of the Lombards, Lomello and the whole Lomellina area were ruled by the Franks and the town became the main centre of the county. Later it became part of the Pavese domain before being controlled by the Visconti Family.
The town displays fine examples of medieval art: the Basilica di Santa Maria Maggiore, one of the most interesting expressions of the Lombard Romanesque style; the Baptistery of San Giovanni in Fontes, of Lombard origin, located next to the Basilica, is undoubtedly the most ancient and precious monument of all Lomellina.
Worth to mention is also the beautiful Romanesque church of San Michele, with an octagonal lantern, and the castle, called "nuovo"(new) ,dating from the XV century, which preserves inside valuable frescoes and fine Roman mosaics found, as other artifacts in the subsoil of the town.