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
Richard II of England with this setback on the continent, Richard turned his attention instead towards France's ally, Scotland. In 1385, the king himself led a punitive expedition to the north, but the effort came to nothing, and the army had to return without ever engaging the Scots in battle. Meanwhile, only an uprising in Ghent prevented a French invasion of southern England. The relationship between Richard and his uncle John of Gaunt deteriorated further with military failure, and John of Gaunt left England to pursue his claim to the throne of Castile in 1386 amid rumours of a plot against his person. With