Victor Amadeus II of Sardinia
Becoming successful in Rome, he married a bookseller's daughter and won a lucrative commission from Charles Emmanuel II, Duke of Savoy. The Duke's son Victor Amadeus II of Sardinia commissioned him in turn to decorate the Royal Palace of Turin in 1675, when he became duke after his father died. He liked Seiter's work so much that he knighted him. Today there is still a gallery there named after him. He also helped decorate in fresco the cupola of the chapel of the Ospedale Maggiore.