Both he and his nephew , Robert Waterton , were with Bolingbroke at the siege of Vilnius in 1391 , and again in 1392 .
In 1391 he was chief steward of Brecon and of Bolingbroke 's other Welsh estates .
Both chief steward and chief steward 's nephew , Robert Waterton , were Bolingbroke Bolingbroke at the siege of Vilnius in 1391 , and again in 1392 .
In 1391 he was chief steward of Brecon and of Bolingbroke 's other Welsh estates .