Here is the intro to a useful site on the War of the Roses. For more go to:
The Wars of the Roses were a series of civil wars fought in medieval England from 1455 to 1487 between the House of Lancaster and the House of York. The name Wars of the Roses is based on the badges used by the two sides, the red rose for the Lancastrians and the white rose for the Yorkists. Major causes of the conflict include: 1) both houses were direct descendents of king Edward III; 2) the ruling Lancastrian king, Henry VI, surrounded himself with unpopular nobles; 3) the civil unrest of much of the population; 4) the availability of many powerful lords with their own private armies; and 5) the untimely episodes of mental illness by king Henry VI.
Here is another site worth visiting:
Has some practical biographies
A ninformative description of the Battle of Bosworth Field
- The deciding Battle in the War.