Sir launcelot's nobles advise him to go to war. who has invaded and laid waste to his lands

The correct answer is King Arthur of Britain.

Explanation:

"Lancelot, the Knight of the Cart" - attributed to Chrétien de Troyes, is a 12th-century poem that relates how Lancelot, one of the Round Table Knights, plans and gets to abduct King Arthur's queen Guinevere. In retaliation, The British King goes after her invading Lancelot's domains. Eventually, Lancelot gives the queen back and offers the king four horses loaded with riches and his shield to be placed in Saint Stephen's Cathedral in a special place so that everyone could see it.

some american cities felt workers were being oppressed by business monopolies