The Enigma variations and Pomp and Circumstance are his most well known works.
Nimrod, the most famous Variation, was dedicated to his German publisher Jaegar (Jaegar is German for Hunter - Nimrod is the biblical Hunter) hence the title.
All the Variations were dedicated to his friends. I read somewhere that they received payment every time an orchestra played the variation dedicated to them. I liked the way he looked after those who had looked after him.