The Circassian language is the heritage language (HL) of a small minority group in Israel. Since its classification as an endangered language around the globe, the focus has been put on effective maintenance programs. Changes in education methods within Circassian communities were inevitable. In Israel, the Circassian Maintenance Program is crucial in primary schools, where formal literacy instruction in the Circassian language begins in fifth grade. This study examined the agentic role of the Circassian literacy teacher in engaging students in learning their heritage language and its maintenance, as expressed in her attitudes, beliefs and knowledge and her classroom strategies. This three-month-long ethnographic data collection was conducted at the teacher’s study centre “Nal” (i.e., a treasure in Circassian). Data was gathered through classroom observations and semi-structured interviews with a Circassian HL teacher to understand her attitudes, beliefs and knowledge and to identify strategies to encourage student engagement in HL learning. In general, the teacher showed expertise in the HL and authentic use of it, as well as cultural and religious competence, adaptability, and flexibility. In addition, she encouraged children’s agency and autonomy and provided individualised support, integration of technology and reflective practice. The results indicated that a sense of identity, unity and belonging to the community are all held together by the pillar of HL knowledge. By engaging her students in translanguaging practices, the teacher promoted their awareness of language patterns, vocabulary and grammar in both Circassian and other languages of their wide linguistic repertoire (Hebrew, Arabic and English).