sentences:  The discontent of the late 1820s, culminating in serious disturbances in 1831, including the Merthyr Rising persuaded the government to take action in favour of reform.Within the Act of 1832 the one significant change in Wales was the carving out of a new parliamentary constituency, centred at Merthyr Tydfil, from the county of Glamorgan.The Parliamentary Boundaries Act 1832 defined the new Parliamentary Borough of Merthyr Tydvil in great detail