The Cāndra school of Sanskrit grammar was popular in medieval Nepal, Tibet, India and Sri Lanka and known as a grammar of the Buddhist tradition. Many scholars have written commentaries on the grammar. Among these commentaries, Dharmadāsaʼs is the only one published to date. Three more commentaries, the Sumatipañjikā, Śabdalakṣaṇavivaraṇapañjikā and Cāndravyākaraṇapañjikā; as well as two subcommentaries on the Cāndravyākaraṇapañjikā, titled Candrālaṃkāra and Paddhati, are extant, manuscripts of which are preserved in Nepal, Tibet, India and England. This dissertation will involve editing the manuscripts and critically examining the text of the Sumatipañjikā. Apart from the text edition, this dissertation will engage with issues such as the transmission of Cāndravyākaraṇa throughout the Indian subcontinent, and most importantly, similarities and differences between the traditions of Candragomin and Pāṇini. All references that appear within the text will be investigated in this dissertation. Since this text cites some sources that have yet to be dated, a critical examination will also help to resolve some of the historical issues connected with them.