Map of the Byzantine, Ottoman and Serbian empires and their neighboring states, 1355 — The Byzantine and Ottoman Empires within a year of the occupation of Gallipoli
Photo Credit: William R. Shepherd's Historical Atlas, p. 89, Henry Holt and Company, NY 1911 - Public Domain, https://commons.wikimedia.org/w/index.php?curid=444748

Sultan Murad II — 2237 - Bavarian State Painting Collections
Photo Credit: By Paolo Veronese - Public Domain, https://commons.wikimedia.org/w/index.php?curid=66343323

Musa Çelebi —
Photo Credit: By Paolo Veronese - Public Domain, https://commons.wikimedia.org/w/index.php?curid=66346753

Mehmed I with his dignitaries — Ottoman miniature painting, kept at Istanbul University
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=2803462

Mehmed I — cropped from Ottoman miniature depicting Mehmed I, Sultan of the Ottoman Empire from 1413 to 1421. The miniature comes from a 16th-century manuscript illustrating the dynasty, and is currently preserved in the Istanbul University Library (MS Yildiz 2653, fol. 261).
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=5920040

İsa Çelebi —
Photo Credit: By Arthus Thomas Sieur d'Embry - Public Domain, https://commons.wikimedia.org/w/index.php?curid=69254934

Süleyman Çelebi —
Photo Credit: By Johann Theodor de Bry - Public Domain, https://commons.wikimedia.org/w/index.php?curid=30207309

cropped Flag of Ottoman Empire —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=7112828

Ottoman Empire in 1683 — At the height of its territorial expansion in Europe
Photo Credit: By Chamboz at English Wikipedia, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=104493643

Battle of Ankara — Mughal painting
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=22407547

Map of the Timurid Empire at its greatest extent under Timur —
Photo Credit: By Stuntelaar - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=5206128