John Ker, born John Crawford in Crawfurdland, Ayrshire, was a Scots Presbyterian linked with Cameronian radicals who between 1705 and 1709 acted as a government informer against the Jacobites. Dogged by financial issues most of his life, he died in King's Bench Prison in 1726.
- Occupation
- politician, spy
- Born
- August 8, 1673
- Died
- July 8, 1726
