 As of the date of taking up the post, referred to as “royal post”, by Sebastian Montelupi, its initial development phase finished.Montelupi's Royal Post was responsible for delivering the parcels to the king once a week, when the ruler was residing in any location within the Crown of the Kingdom of Poland, or once every three weeks when he was residing in Lithuania.The route to Venice was operated every 15 days and to Vilnius every 17 days.