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Siân Gwenllian represents the Arfon constituency in the Senedd/Welsh Parliament. She was elected for the first time in 2016, and was re-elected in 2021 with a higher percentage of the vote than any other candidate throughout Wales, doubling her majority with 63.3% of the vote. She is proud to have succesfully campaigned for a new medical school for the north of Wales based in Bangor in her constituency.

She currently holds the Housing and Planning portfolio for Plaid Cymru (2024-) following her role as the Lead Designated Member in the Co-operation Agreement (2021-2024).

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