In August 1365, Hondarribia concluded a commercial treaty with Charles II of Navarre, under which he would construct a warehouse in his port of Monzón, in Andara (Lesaca), where Navarrese merchants could unload their goods for transport to the sea, and would also build, near the port, a bridge for the passage of people, animals, and goods. The king committed to maintain the roads in his kingdom up to the warehouse and bridge, and the council of Hondarribia pledged, at its own expense, to create a suitable route from the warehouse and bridge by land and water, “removing obstacles, clearing and widening the river and roads, so that a ship of forty cargas could reach the port by water, and the goods could travel safely by land and water to the said town or to the large ships, the merchants paying the sailors, boats, and mule drivers their wages.”
Merchants making this journey would be exempt from all other duties, paying six cornados or six carlin coins per load, without any new tolls, taxes, or levies, except if they bought or sold in Castile goods that were prohibited and subject to tithes. Merchants transporting Navarrese wine through the port could load it and take it wherever they wished by ship, or sell it in Hondarribia under their jurisdiction, in bulk, in barrels or casks, “not selling in taverns or retail,” paying the six dineros. For each quintal of iron loaded at the port, they had to pay 4 maravedís.