Below is a list of people who have served as Lord Lieutenant of Northamptonshire. Since 1735, all Lords Lieutenant have also been Custos Rotulorum of Northamptonshire. The lieutenancy included the Soke of Peterborough until 1965, when the Lord Lieutenant of Huntingdonshire became Lord Lieutenant of Huntingdon and Peterborough. This merged with the lieutenancy of Cambridgeshire and Isle of Ely in 1974, forming the jurisdiction of the present Lord Lieutenant of Cambridgeshire.
Deputy lieutenants.
Deputy lieutenants traditionally supported the Lord-Lieutenant. There could be several deputy lieutenants at any time, depending on the population of the county. Their appointment did not terminate with the changing of the Lord-Lieutenant, but they often retired at age 75. 
References.
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Bibliography