William Kinaston was a member of a junior branch of the Shropshire Kynastons, who had been seated at Ruyton since the sixteenth century. A Whig and an active member of the Shrewsbury corporation, he is said by a political opponent to have
come in to be mayor by a writ of mandamus though he was neither rightly elected nor the senior alderman; he acted partially during his time and used such indirect means to compass his designs that his name became odious ... the corporation lost their grandeur; honour, honesty, and justice were expelled the house; tyranny and oppression ruled in their stead for many years,
Salop Arch. Soc. Trans. (ser. 3), i. 219-221; (ser. 4), iv. 64.
a reference to the new bye-laws concerning the admission of freemen passed in his mayoralty, which eventually gave the Whigs control of the franchise.
On becoming a master in Chancery Kinaston gave Lord Chancellor Macclesfield a present of 1,500 guineas. When the state of the chancery suitors funds was investigated in 1724 he was found to have a deficit of over £26,900, but retained his office after giving security for the debts.
