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Why did Murad I make Edirne the Ottoman capital?

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This map shows the territorial expansion of the Ottoman Empire from 1300 to its greatest extent in 1683-99, highlighting different periods under rulers such as Mehmed II, Selim I, and Süleyman the Magnificent, and marking key cities, seas, and geographical boundaries in Europe, North Africa, and the Middle East. — Ottoman Empire Map showing the expansion of the Ottoman Empire from about 1300 to 1700. The empire reached its greatest extent between 1683 and 1699.

Murad I established Edirne (formerly Adrianople) as the Ottoman Empire capital following its capture in 1361 to serve as a vital administrative and military hub for the empire's European territories.1

The city's strategic location provided several key advantages:

Control of Invasion Routes: As the primary fortress situated between Constantinople and the Danube River, Edirne commanded the main invasion road through the Balkan Mountains.1
Consolidation of Power: It functioned as a center for the administrative and military control of Thrace, which helped ensure the retention of Ottoman conquests in Europe.1
Facilitation of Expansion: By securing this position, the Ottomans were better equipped to launch and support further military campaigns to the north.1