Mubarak Al-Sabah of Mubarak's supposed assassination plot spread throughout the Ottoman Empire and abroad, which proved a serious obstacle in establishing his legitimacy as a ruler. Mubarak acted quickly to bribe the Ottoman bureaucracy through lavish gift giving in order to gain support for his appointment as kaymakam [sub governor] of Kuwait like his previous brothers. This is further illustrated through a memorandum by Captain J.F. Whyte, a British agent stationed in Basra: “Sheikh Mubarak has, since his usurpation, been employing his late brother’s wealth to secure his recognition as Sheikh and his appointment as Kaimakam of Koweit by the Sublime Porte.”
Rise of the Ottoman Empire large Ottoman fleet attacked Salonika by surprise. The Venetians signed a peace treaty in 1432. The treaty gave the Ottomans the city of Salonika and the surrounding land. The war between Serbia and Hungary and the Ottoman Empire had come to a standstill in 1441 when the Holy Roman Empire, Poland, Albania, and the Jandarid and Karamanid emirates (in violation of the peace treaty) intervened against the Ottomans. Niš and Sofia fell to the Christians in 1443 and the year after the Empire suffered a major defeat in the Battle of Jalowaz. July 12, 1444 Murad signed a treaty that