At the same time, his administration of Thessaly, where he settled new peoples, founded the town of Tyrnavos and revitalized the economy, set the groundwork for Ottoman rule in the area for centuries to come.
[5] He became governor of Thessaly in early 1423, and led his first major expedition in May–June of the same year, against the Byzantine and Latin domains in the Peloponnese peninsula in southern Greece.
Aside from the plunder, the expedition was also probably a reconnaissance mission ultimately aimed against Venetian possessions in the area, as Venice was the main driving force behind attempts to unite the various Christian rulers of Greece against the Ottoman advance in the Balkans.
[8][9] Despite the devastation visited upon the Peloponnese, Turahan's 1423 expedition was only a raid, and the Byzantine Despots of the Morea were able to restore their position and gradually over the next few years bring the entire peninsula under their control.
[6][12] The Despotate of the Morea, under the constant threat of renewed Turkish invasion, clung on to a precarious independence only through continuous gifts and payment of tribute to Turahan.
Although the Hungarians were badly mauled in the Battle of Zlatitsa, in a subsequent action at Kunovica they were able to capture Mahmud Bey, the Sultan's son-in-law, creating the impression of an overall victorious campaign.
[28] His descendants, the Turahanoğlu, were wealthy landowners in Thessaly until the end of the Ottoman rule there in the late 19th century; with the exception of his sons however, they did not rise to any wider prominence.
Aside from his campaigns of conquest, he brought in 5,000 Turkish settlers (Yörüks and Koniars) whom he settled in a string of twelve villages across the province to strengthen Ottoman military control.
[31] In addition, according to Turahan's Arab-language biography, which the Scottish traveller David Urquhart reported to be still extant in the 1830s in Tyrnavos, he was also the first to institute a Greek militia for the lawless mountainous regions of central Greece, the forerunners of the later Armatoloi.
[32] Turahan also took several measures to restore order and prosperity in his province, most notably the foundation (or re-foundation) of the town of Tyrnavos, which before was a small pastoral settlement.
[36] He also took care to maintain and foster the Thessalian cotton, silk and wool textile industry, to the extent that later generations attributed to him the introduction of new dye techniques based on yellow berries, madder and the kali plant, used in the manufacture of potash.