Michael Hicks 
Richard III and his Rivals [PDF ebook] 
Magnates and Their Motives in the Wars of the Roses

Richard III is undoubtedly the dominant personality in this collection of essays, but not in his capacity as king of England. Richard was Duke of Gloucester far longer than he was king. For most of his career, he was a subject, not a monarch, the equal of the great nobility. He is seen here in the company of his fellows: Warwick the Kingmaker, Clarence, Northumberland, Somerset, Hastings a the Wydevilles. His relations with these rivals, all of whom submitted to him or were crushed, show him in different moods and from various vantage points.