The Mosques in Islam (p. 13), in addition to Arabic sources, cites Theodor Nöldeke and others as having considered a mihrab to have originally signified a throne room.
Some of Nöldeke's studies are included in The Origins of The Koran: Classic Essays on Islam’s Holy Book edited by Ibn Warraq.
Theodor Fontane | Theodor Mommsen | Theodor Herzl | Carl Theodor Dreyer | Thomas Theodor Heine | Theodor Boveri | Theodor Meynert | Theodor Storm | Theodor Loos | Theodor Leschetizky | Theodor Kittelsen | Theodor Eimer | Theodor Schwenk | Theodor Leutwein | Theodor Kirchner | Theodor Heuss | Theodor Estermann | Theodor Busse | Theodor Anton Ippen | Karl-Theodor zu Guttenberg | Karl Theodor Anton Maria von Dalberg | Karl Theodor | Johannes Theodor Reinhardt | Theodor Wertheim | Theodor Uppman | Theodor Reuss | Theodor Reik | Theodor Kullak | Theodor Körner | Theodor-Heuss-Gymnasium Heilbronn |