Why does Marlin help uther decieve igraine and the duke or Cornwall?

Marlin helps Uther deceive Igraine and the Duke of Cornwall because he seeks to fulfill Uther's desire for love and power. Uther's passion for Igraine drives him to pursue her at any cost, and Marlin, as a powerful wizard, uses his magic to facilitate this deception. By orchestrating the situation, Marlin aims to ensure that Uther can claim his rightful place as king, believing that a strong ruler is necessary for the stability of the realm. Ultimately, the deception sets off a chain of events that shape the destiny of Arthurian legend.