On March 12, 1610, Galileo wrote his dedicatory letter to the Duke of Tuscany, and the next day sent a copy to the Grand Duke, hoping to obtain the Grand Duke's support as quickly as possible. On March 19, he sent the telescope he had used to first view Jupiter's moons to the Grand Duke, along with an official copy of "Sidereus Nuncius" ("The Starry Messenger") that, following the secretary's advice, named the four moons the Medician Stars. In his dedicatory introduction, Galileo wrote: