Final answer:
The Ottoman Empire is recognized for its grand and well-planned capital, Constantinople, especially after its conquest by Sultan Mehmed II in 1453 and subsequent development into a trade and cultural hub known as Istanbul.
Step-by-step explanation:
The Muslim empire known for its grand and well-planned capital is the Ottoman Empire. The Ottomans, with their Turkic origin, made Constantinople, known as Istanbul after its conquest in 1453, a world-renowned capital.
This was largely due to Sultan Mehmed II, who not only conquered the city but also invested in its cultural and intellectual revival. Architecture, science, and the arts flourished under his rule.
The Ottomans ruled over a diverse and technologically advanced empire that at its height threatened the very gates of Vienna, while their capital city facilitated trade between the Silk Roads and Europe.
The city of Istanbul, a hybrid of Byzantine legacy and Ottoman innovation, featured impressive architectural marvels, including grand palaces, bazaars, and mosques, which illustrated the empire's might and emphasis on urban planning and cultural development.