Principata e Kastriotëve
In the document, dated on October 12nd, 1415, is written for Ishmi customs port. It testifies to the existence of a customs network, an indispensable element for the existence of a state, as it was the feudal principality of Kastriot, with Ishmi part of it. From this document, we learn also for export of grain and timber from principality,, therefore, for commercial exchanges with the outside world, mainly in Ragusa.