Diwali was also described by numerous travellers from outside India. In his 11th century memoir on India, the Persian traveller and historian Al Biruni wrote of Deepavali being celebrated by Hindus on the day of the New Moon in the month of Kartika. The Venetian merchant and traveller Niccolò de' Conti visited India in the early 15th-century and wrote in his memoir, "on another of these festivals they fix up within their temples, and on the outside of the roofs, an innumerable number of oil lamps... which are kept burning day and night" and that the families would gather, "clothe themselves in new garments", sing, dance and feast. The 16th-century Portuguese traveller Domingo Paes wrote of his visit to the Hindu Vijayanagara Empire, where "Dipavali" was celebrated in October with householders illuminating their homes, and their temples, with lamps.