I didn't know that the Romans went there.
St. Thomas the Apostle evangelized India. That's why southern India is Catholic with many males named THOMAS.
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According to traditional accounts of the Saint Thomas Christians of India, the Apostle Thomas landed in Muziris (Cranganore) on the Kerala coast in AD 52 and was martyred in Myalpur, near Madras in AD 72. ... It was his mission to espouse India to the One-Begotten.
I read a book on it and was quite surprised to the scale of it. There’s been a growing archaeological effort in the region that shows fortified Roman ports which supported the trade.