Robertson was born near the Leicestershire- Derbyshire border at Netherseale,[1] into a wealthy landowning family.
He was a distant relative of 18th century Scots historian and academic William Robertson.
He attended Worcester College, Oxford, and received legal training at Lincoln's Inn.
As a legally trained landowner and gentleman, he was active in local administration, first as a justice of the peace.
In 1862, he was appointed Deputy Lord Lieutenant[3] of Leicestershire, and in 1870, he became High Sheriff of Derbyshire.