Final answer:
During the Delhi Sultanate period, the Caliphs' recommendation was necessary for the sultans' legitimacy.
Explanation:
The Delhi Sultans required the recommendation of the Caliphs for legitimacy during the period of the Delhi Sultanate, which ruled northern India between 1206 and 1526 CE. The relationship between the Delhi Sultanate and the Caliphs reflected political and religious connections between India and the Abbasid Caliphate.
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