In 1629, he went to live in Italy for a year and a half. Though his first Italian visit is recognized as a crucial chapter in the development of Velázquez's style – and in the history of Spanish Royal Patronage, since Philip IV sponsored his trip – we know rather little about the details and specifics: what the painter saw, whom he met, how he was perceived and what innovations he hoped to introduce into his painting. It is canonical to divide the artistic career of Velázquez by his two visits to Italy, with his second grouping of works following the first visit and his third grouping following the second visit. This somewhat arbitrary division may be accepted though it will not always apply, because, as is usual in the case of many painters, his styles at times overlap each other. Velázquez rarely signed his pictures, and the royal archives give the dates of only his most important works. Internal evidence and history pertaining to his portraits supply the rest to a certain extent.