most certain attestation of the panettone is found in a register of expenses of the Borromeo college of Pavia in 1599: on 23 December of that year in the list of courses provided for lunch Christmas costs also appear for 5 pounds of butter, 2 of raisins and 3 ounces of spices given to the baker to make 13 "loaves" to be given to college students on Christmas Day. Parks and gardens The municipality of Pavia is part of the Ticino Valley Natural Park and preserves two forests (Strict nature reserve Bosco Siro Negri and Bosco Grande nature reserve) that they show us the original state of the nature of the Po valley before the arrival of the Romans, before human settlement. To the north and east of the city, a small stream, originating from springs, the Vernavola, gives rise to a deep valley, escaped from urbanization, which is home to the Vernavola Park, while to the west, the green ring around Pavia is closed by the Sora Park. 9% of the surface of the municipality of Pavia is occupied by natural areas, parks or gardens (about 594 hectares, 1467 acres, of which 312 are covered with broad-leaved woods). Vernavola Park: large park, heir of the Visconti Park, with an extension of 35 hectares located north of the city. The battle of Pavia in 1525 is fought in the park. Ticino Valley Natural Park: regional park located along the banks of the Ticino river from Lake Maggiore to the river Po. It forms a green belt around the city. Bosco Grande nature reserve: the Bosco Grande covers an area of about 22 hectares (corresponding to approximately 54,34 acres) southwest of Pavia, it represents one of the last remnants of that lowland forest that in past times entirely covered the Po Valley and of which an important testimony remains in the Ticino Valley Natural Park. Strict nature reserve Bosco Siro Negri: the reserve is a small strip of the Po Valley that was donated to the University of Pavia in 1967 by Giuseppe Negri, a lumber dealer and a great lover of nature. The reserve is located near the Ticino, a few kilometers from the center of Pavia. The forest show us the original state of the nature before the arrival of the Romans, before human settlement. The reserve covers an area of 34 hectares, corresponding to approximately 84 acres. Sora