in the time of King Alfred. In Elisse's time, the Viking raids threatened Brycheiniog, so in the 880s Elisse became a vassal of Alfred, to help protect his realm; indeed, in the spring of 896, Brycheiniog, Gwent and Gwynllwg were devastated by the Norsemen who had wintered at Quatford near Bridgnorth that year. According to Asser's contemporary account, Elisse also feared the malevolence of the kings of Seisyllwg and Gwynedd who had succeeded Rhodri Mawr; his vassalage to Alfred provided him with potential support against Seisyllwg. According to an early 14th century writer, a king of Brycheiniog and Ferlix named Hwgan (Huganus in Latin), noting that Edward the Elder (king of Mercia) was preoccupied by the Great Heathen Army, attempted to conquer (or raid) Mercia. He had not known Edward's sister, Æthelflæd (the daughter of King Alfred and widow of Earl Æthelred of Mercia), would be a force to be reckoned with; Æthelflæd successfully resisted his attempts, and, in the early summer of 916, pushed her advantage by invading Brycheiniog. On 19 June, Æthelflæd stormed the royal llys (court) in Llangorse lake, and captured the queen of the land and 34 others. Hwgan responded by seeking an alliance with the Danes, but died soon afterwards while defending Derby (a Danish-held city) from the Saxons. The earlier Anglo-Saxon Chronicle also reports these events, but without naming the Brycheiniog king, or mentioning his raid against Mercia; it was, though, Æthelflæd who defeated the Danes at Derby. As a result of Hwgan's behaviour, his son, Dryffin (also known as Tryffin) was forced by King Athelstan to pay tribute. Athelstan's godson and namesake, Elystan Glodrydd, deprived Dryffin of Ferlix, merging it with his own realm of Buellt. Nevertheless, records like the Book of Baglan still have Dryffin's descendants as rulers of Brycheiniog; Hwgan (and hence Dryffin) is named there as a direct descendant of Tangwydd. What state the kingship of Brycheiniog was in at this time is not completely certain; Elisse ap Tewdwr's son, Tewdwr ap Elisse, was certainly ruling between 927 and 929. Tewdwr ap Elisse is reported to have witnessed a charter at the English royal court in 934, along with Hywel Dda. After Tewdwr ap Elisse, no more kings of Brycheiniog are recorded from his line. Gerald of Wales states that after Tewdwr's death, Brycheiniog was divided between the three sons of Tewdwr's brother, Griffri: Tewdos (or Tewdwr), Selyf, and Einon;