Medieval Indian History GK Part 3 For CGL & SI Exam: Iltutmish defeated Yaldauz in AD 1215 in the battle of- Tarain. Iltutmish obtained a ‘Letter of Investiture’ from the Abbasid Caliph of Baghdad to gain legitimacy in A.D.- 1229. Who insisted on the ceremony of sijada (prostration) and paibos (kissing of the monarch’s feet)