The Laws in Wales Act 1535 (26 Hen. VIII, c. 26) provided for a single county seat in the House of Commons for each of twelve historic Welsh counties (including Pembrokeshire) and two for Monmouthshire. Using the modern year, starting on 1 January, these parliamentary constituencies were authorised in 1536. In practice, the first known Knights of the Shire from Wales (as Members of Parliament from county constituencies were known before the nineteenth century) may not have been elected until 1545.