The Mughal empire, which dominated Hindustan for two centuries, was heavily influenced by Persian culture --so much that persian language was commonly used by the ruling classes of that time. This is probaly why they adopted too the Persian emblem of the lion and the sun as their own.
Source: «Flags of The World» (FOTW) website:India before British Rule
Sizes: ensign W10 x L24 mm, mast flags W9 x L18 mm, jack W6 x L12 mm.
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