Columbia subject headings:
Abū Ayyūb al-Anṣārī, Khālid ibn Zayd, -approximately 672--Fiction.
Harvard subject headings:
Abū Ayyūb al-Anṣārī, Khālid ibn Zayd, -approximately 672--Fiction.
Istanbul (Turkey)--History, Military--To 1453--Fiction.
Istanbul (Turkey)--History--7th century--Fiction.
Princeton subject headings: