The most interesting of this reference from Charles V of France, is that an Ampoule of hours is defined as "ung grant orloge de mero" ("a great sea watch"), this together with the fact that the first explanation of its use at sea it appears in " the twelfth of the Crestià " (work by M.Llauradó on Francesc Eiximenis ) and that it was given to him by his aunt Yolanda de Aragón, suggests that, in this period, the importance of an hourglass was commonly Related to its use at sea and its manufacturing demand, it could have originated from the navigation needs of the Crown of Aragon, a maritime power of the moment in the Mediterranean. 