The tercentenary year of the second siege of Vienna by the Turks has seen the first-fruits of a long-planned venture, the publication in full of the Ottoman documents preserved in the Haus-, Hof- und Staatsarchiv. This first part presents, in facsimile and with full transcription and translation, the texts of 36 documents issued in the name of Süleymān the Magnificent (1520–66), one being addressed to Charles V as ‘King of Spain’, 28 to Ferdinand I as ‘King of Austria’ and later as Emperor, and seven to Ferdinand's son and successor, the Emperor Maximilian. The earliest, a remarkably splendid fragment, is the beginning of a fetḥnāme, probably sent from Baghdad in December 1534 to report victories in Persia to Ferdinand as being (ostensibly) a friendly neighbour after the conclusion of peace the previous year; nos. 2–8 relate to negotiations during the war-years 1541–7; nos. 9–15, mainly recriminations over frontier skirmishes but with another fine fetḥnāme (no. 11) of 1549, belong to the brief period of uneasy peace; nos. 16–27 concern peace-feelers and embassies during the war-years 1551–62, no. 25 being the 'ahdnāme; a main topic of the remainder is the tribute, while no. 32 is the renewal of the 'ahdnāme of 1562 in favour of the new emperor Maximilian.