That tribunal is the Welsh Language Tribunal where the Welsh Ministers are the appointing authority (Welsh Language Tribunal (Appointment) Regulations SI 2013 No.3139 (W.312), Regulation 4).
Tribiwnlys y Gymraeg yw’r tribiwnlys hwnnw, a Gweinidogion Cymru yw’r awdurdod penodi (Rheoliadau Tribiwnlys y Gymraeg (Penodi) OS 2013 Rhif 3139 (Cy.312), Rheoliad 4.).