What is importance of Mehmed II in ottoman empire

What were Mehmed II's achievements? Mehmed the Conqueror expanded the Ottoman Empire, leading the siege of Constantinople in 1453 and extending the empire's reach into the Balkans. This westward expansion across the heart of the former Eastern Roman Empire led him to declare himself Kayser-i Rum (Roman Caesar).

Explanation:

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frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.