Year 1398 (MCCCXCVIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. Events January–December March 15 – Trần Thuận Tông is forced to abdicate as ruler of the Trần Dynasty in modern-day Vietnam, in favour of his three-year-old son Trần Thiếu Đế. April - May – The Bosnian nobility dethrone Queen Helen and replace her with Stephen Ostoja. June 25 – Jianwen succeeds his grandfather, Hongwu, as Emperor of Ming Dynasty China. July – The Stecknitz Canal is completed between the rivers Elbe and Trave (at Lübeck) in modern-day north Germany, one of the earliest navigable summit level canals in the world. September King Richard II of England exiles his cousin Henry Bolingbroke (the future Henry IV of England) for 10 years, in order to end Henry's feud with Thomas de Mowbray, 1st Duke of Norfolk, who is also exiled. As France withdraws its support for Antipope Benedict XIII, an army led by Geoffrey Boucicaut occupies Avignon, and starts a five-year siege of the papal palace. October 12 – The Treaty of Salynas is signed by Vytautas, Grand Duke of Lithuania, and Konrad von Jungingen, Grand Master of the Teutonic Knights, in an attempt to cede Samogitia to the Knights. October 14 – King Taejo of Joseon abdicates the throne of the Joseon dynasty in modern-day Korea, following the murder of his heir Yi Bangsuk, during a coup by Yi's older half-brother, Yi Bang-won, in The First Strife Of Princes. Taejo's eldest son Jeongjong succeeds to the throne. November 11 – Janus succeeds his father, James I, as King of Cyprus and claimant to the throne of Armenian Cilicia. December 17 – Timur defeats the last ruler of the Delhi Sultanate, which has been weakened after four years of civil war. Following his victory, Timur's Islamic troops sack the city of Delhi, and proceed to massacre hundreds of thousands of the state's Hindu inhabitants. Date unknown The Teutonic Knights recommence their raids of Lithuania. The Teutonic Knights conquer the island of Gotland, near Sweden, which has previously been run by the piratical Victual Brothers. Martin of Aragon launches a crusade against the Moors in North Africa. The Kingdom of Singapura falls, after being invaded by the Majapahit Empire. Abdullah succeeds Abu Amir as ruler of the Marinid dynasty in modern-day Morocco. Bunei succeeds his father, Satto, as King of Chūzan (modern-day central