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| | 1428. 2001. The Encyclopedia of World History |
 | | Despite his impressive feats domestically and abroad, however, his period of rule was accompanied by economic problems and discontent, due to the periodic debasement of the currency, the increases in taxes, the confiscations of property, and other unpopular measures used to raise revenue. |
 | | In several major campaigns, the Ottomans occupied the southern part of Serbia (145455), mounted an unsuccessful siege of Belgrade (1456), and then annexed the rest of the country with the exception of Belgrade (1459). |
 | | Conflicts between the two Byzantine rulers of the Morea, and their failure to continue the payments of tribute to the sultan, led to Ottoman military intervention and the annexation of the peninsula, including Athens. |
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