Meitei classical language movement
The Meitei language (officially known as Manipuri) movement seeks to achieve recognition of Meitei as a Classical language of India. It was supported by various literary, political, social associations and organisations as well as notable individual personalities of Bangladesh, Myanmar, Northeast India (prominently Assam, Manipur and Tripura).
Source: Wikipedia — Meitei classical language movement (CC BY-SA 4.0)