"Emancipate Sir Reginald" is an objective in the sidequest You Are Cordially Invited: Party Prep in Borderlands 2
Walkthrough[edit]
With Madam Von Bartlesby rebuffed, approach the large mound. On the right-hand side of it you will find a large glass jar with a tiny Varkid inside it. Grab it to liberate good Sir Reginald.