The purpose of the paper is to establish whether the archives kept in Dubrovnik contain data on medieval trade and economic relations between the Dubrovnik Republic and Croatia. The systematic review of the unique notary series "Debita notariae" gives evidence of such connections being present either in direct contacts among tradesmen or indirectly. Most of the records have to do with credit transactions and operations of trade companies. The question of whether the term "hungarus" also denotes a Croat is yet to be investigated.