Campaigners are marching from Cathedral Road in Cardiff to Llandaff Cathedral to show their support for White Ribbon Day.
Candles will be lit at the cathedral as part of the campaign raising awareness of domestic abuse.
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Kirsty Williams successfully defended her Brecon seat, but her party lost four others in a disastrous night.
The body of 75-year-old Iris Owens from Ystrad Mynach was found on Tuesday.
Tree pollen levels remain high over the next few days, but they will fall during any showers over the weekend.