Which Grand Duke is known for issuing written invitations in the early 14th century asking craftsmen and traders to settle in Vilnius and other areas?
Note
Grand Duke Gediminas (reigned early 14th century) sent a series of written letters to Western merchants, artisans, and church leaders inviting them to settle in Vilnius and other territories. These letters (dated c. 1323–1324) reflect his policy of encouraging urban development, trade, and diplomatic ties with Western Europe during a period of state consolidation and expansion.