There was two houses, the House of York and the House of Lancaster. The House of York was represented with a white rose and the House of Lancaster was a red rose.
Richard III Guilty or not
I think Richard is guilty of killing his nephews because they were in line for the throne first and with them gone he would become king. They also found two small skeletons under the stairs
Battle of Bosworth Field
At the Battle of Bosworth field Henry Tudor killed Henry III and they paraded his battle through Leicester.
Henry Tudor and the House of Tudor
Henry Tudor won the battle of Bosworth field and was the last king from the family known as Plantagenet.