William Stukeley (7th November 1687 – 3rd March 1765) was an English antiquarian, physician, and Anglican clergyman who pioneered the archaeological investigation of the prehistoric monuments of Stonehenge and Avebury.
He was elected a Fellow of the Royal Society in 1718 and became the first secretary of the Society of Antiquaries of London. In 1721 he became a Freemason and in 1722 co-founded the Society of Roman Knights, an organisation devoted to the study of Roman Britain.
In the early 1720s, Stukeley developed a particular interest in Stonehenge and Avebury, two prehistoric stone circles in Wiltshire. He visited them repeatedly, undertaking archaeological fieldwork to determine their dimensions.
A friend of Isaac Newton, he was also among Newton’s first biographers and has been described as “probably … the most important of the early forerunners of the discipline of archaeology” for his practice of personally visiting and examining ancient sites.
There’s more about him on Wikipedia and the page has some interesting links to his works