What was Donato Bramante’s role in planning the cathedral of Pavia?

In 1488, Cardinal Ascanio Sforza, the bishop of Pavia, invited Donato Bramante and several other architects to create a new plan for the city's cathedral. During this period, Bramante visited the city frequently, and it was likely under his direction that the crypt and the lower portion of the structure were executed.1

While the cathedral was begun in 1488 by Cristoforo Rocchi, whose model remains extant, Bramante’s involvement was part of the collaborative architectural efforts of the time.12