Question

According to you who were the 'sanatanis'

Answer 1

it's means Orthodox
according to my point of view

Answer 2

Sanatanis were high-class conservative Hindus practicing untouchability.

As an ‘alternative, indigenous name’, “Sanatana Dharma” (Devanagari which has a meaning of "eternal dharma or eternal order") was suggested.

It is now mistakenly connected with Hinduism alone. During the “Hindu revivalism movement”, the word was used to prevent using the non-native (Persian) word "Hindu."

In “classical Sanskrit literature”, e.g. in the Manusmrti and in the Bhagavata Purana, the term dharma sanatana occurs in a context similar to "divine order".