The infamous War of the Roses was mainly between which two English counties?

The infamous War of the Roses was mainly between Lancashire and Yorkshire. More precisely, the Wars of the Roses were a series of dynastic civil wars fought between supporters of the House of Lancaster and the House of York for control of the English throne.

The conflict lasted roughly from 1455 to 1487 and grew out of rival claims within the Plantagenet royal family. Lancaster used a red rose as its emblem, while York became associated with a white rose. The famous name was popularized later; people living through the wars generally referred to them as civil wars or the Cousins' War.

The conflict was not literally a war between modern county governments, and fighting spread across much of England, Wales, Ireland, and Calais. However, Lancaster and York were the dynastic names, and their association with Lancashire and Yorkshire created a lasting county rivalry. Major battles included Towton in Yorkshire in 1461 and Bosworth Field in Leicestershire in 1485.

The wars ended when Henry Tudor defeated Richard III and became Henry VII. Henry strengthened his claim by marrying Elizabeth of York, symbolically uniting the red and white roses in the Tudor Rose.