Amarasimha is the name of a :

Amarasimha was a renowned Sanskrit scholar and lexicographer of ancient India, best known for compiling the 'Amarakosha' (also known as Namalinganushasanam) [1]. This work is considered the oldest extant Sanskrit thesaurus or lexicon, systematically listing synonyms and genders for thousands of words. Traditionally, Amarasimha is identified as one of the 'Navaratnas' (nine gems) in the court of King Vikramaditya, who is often associated with the Gupta emperor Chandragupta II. While some sources describe him as a Buddhist scholar, his work became a foundational text across various Indian traditions, including Brahmanical and Jain education systems, due to its precision in vocabulary and grammar [1]. His contribution remains a cornerstone of classical Sanskrit literature and lexicography.

Sources

1. [1] History , class XI (Tamilnadu state board 2024 ed.) > Chapter 7: The Guptas > Sanskrit Grammar > p. 99