Son of the first marriage of Giovanni Battista Castello ("Il Bergamasco"), Granello came to Spain while still a child, around 1567, accompanying his stepfather, and called by Álvaro de Bazán, 1st Marquis of Santa Cruz to work on his palace in Viso del Marqués.
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He went to the Royal Monastery of San Lorenzo de El Escorial with his half-brother Fabrizio Castello and other team members who had accompanied his stepfather from Genoa, including brothers Gian Maria and Francesco da Urbino, Francesco da Viana and others, with whom he worked continuously in the decoration of vaults and some walls of various units of the basilica and monastery of El Escorial until his death.
Niccolò Machiavelli | Niccolò Paganini | Niccolò Jommelli | Niccolò Ammaniti | Niccolo Jommelli | Niccolò da Tolentino | Giovanni Niccolò Servandoni | Niccolò Zucchi | Niccolò Tommaseo | Niccolò Piccinino | Niccolò Ludovisi | Niccolo Tommaseo | Niccolo Rondinelli | Niccolò Rinaldi | Niccolò Piccinni | Niccolò Pandolfini | Niccolò Orlandini | Niccolò Machiavelli | Niccolò III d'Este, Marquis of Ferrara | Niccolò III d'Este | Niccolò Fontana Tartaglia | Niccolò di Segna | Niccolò di Pietro Gerini | Niccolò dell'Abbate | Niccolò de' Conti | Niccolò Cassana | Niccolò Albergati | Equestrian Statue of Niccolò da Tolentino |