Wikipedia
Aldborough was a parliamentary borough located in the West Riding of Yorkshire, abolished in the Great Reform Act of 1832. Aldborough returned two Members of Parliament (MPs) from 1558 until 1832.
Aldborough was a " scot and lot" borough, meaning that any man paying the poor rate was eligible to vote. Nevertheless, it was a small borough (not even including the whole parish of Aldborough, since Boroughbridge, also within the boundaries, was also a borough with its own two MPs), and by the time of the Reform Act it had a population only just over 500 and an electorate of less than 100. This made it a pocket borough and easy for the local landowner to dominate.
In the 18th century, Aldborough was controlled by the Duke of Newcastle. In April 1754 Newcastle, who had just become Prime Minister, selected his junior colleague and future Prime Minister, William Pitt (Pitt the Elder), to sit as its MP. Pitt represented Aldborough for two-and-a-half years, but having fallen out with Newcastle and been dismissed from his ministry, he was forced to find a new constituency when he next needed to be re-elected to the Commons in 1756.