There were three young men whose lives were to continually revolve around one another: King Richard; Thomas Mowbray; and Henry Bolingbroke. They were all born within a year of each other, and the decisions made by one would entangle, affect, or defeat the others. The destinies of the three were intertwined, and yet they had very little in common.
1 There is no historical reason to think that Mowbray wore green. It is pure invention on my part. A literary allusion to the fact that he was the earl of Nottingham.
2 Signet rings were not merely a frivolous convenience; nor a display of ostentation or wealth. They were a necessity. Signet rings and seals for documents were an absolute necessity of business during the lifetime of John of Gaunt and his son, Henry Bolingbroke. When men could not affix their signature to a legal document, seals and signet rings accomplished this legal essential, while still proving the authenticity of the document's author.
Consider two facts about this period of history. Richard II was the first king of England capable of signing his own name! And John of Gaunt's household was fairly unique in the realm because of the fact that the duke of Lancaster considered the ability to read a necessary skill for his children to acquire. Most noble and royal families thought it was more than enough to teach their sons the essential skills for warfare and knighthood. John of Gaunt breached the social norms of his time, by educating not merely his sons, but also his daughters! This fact was to play a significant roll in history, when his daughter, Philippa Lancaster married into the Portuguese royal family and her son, Henry the Navigator, arranged what we would nowadays call a Think Tank - on navigational problems. The new world would likely not have been discovered without this little known wrinkle in history.