John of Gaunt return for a large annual payment and the marriage of their daughter Catherine to John of Trastámara's son Henry. John left Portugal for Aquitaine, and he remained in that province until he returned to England in November 1389. This effectively kept him off the scene while England endured the major political crisis of the conflict between Richard II and the Lords Appellant, who were led by John of Gaunt's younger brother Thomas of Woodstock, Duke of Gloucester. Only four months after his return to England, in March 1390, Richard II formally invested Gaunt with the Duchy of Aquitaine, thus providing
John of Gaunt agree to the imposition of the first Poll Tax in English history – a viciously regressive measure that bore hardest on the poorest members of society. There was organised opposition to his measures and rioting in London; John of Gaunt's arms were reversed or defaced wherever they were displayed, and protestors pasted up lampoons on his supposedly dubious birth. At one point he was forced to take refuge across the Thames, while his Savoy Palace only just escaped looting. It was rumoured (and believed by many people in England and France) that he intended to seize the throne for himself