A new schedule will launch for BBC Radio Cymru in the autumn, and will include a new morning show presented by Camp Lawn's Eleri Siôn and Daf Du.
In addition, Jonsi will move from the morning slot to afternoons.
Hywel Gwynfryn, whose voice was the first to be heard on Radio Cymru, is to cement his role as "ambassador for Radio Cymru" by reporting from communities throughout Wales and contributing to programmes across the station's schedule.
The revamped schedule is designed to respond to the demands of audiences across Wales and to extend Radio Cymru's reach among listeners.
The new weekday schedule will be:
08:30 – 10:30 Daf Du and Eleri Siôn
10:30 – 12.00 Nia Roberts
12:00 – 13:15 Taro'r Post
13:15 – 14:00 Various
14:00 – 17:00 Jonsi