What level of education is this aimed at, because "the heir to the throne died in a drunken boat accident off barfleur which caused a succession crisis between the daughter of Henry 1 and her cousin" is significantly different to "Henry 1 didnt have a son".
min 9:00: Henry the Fouler ist probably an attempt to read his German Nickname "Heinrich der Vogler" or "Heinrich der Vogelsteller" according to an English toung. That means he loved hunting birds, or maybe hunting with birds (falcons).