According to the local tradition, the Black Knight represented Sir Ralph de Assheton who lived in the fifteenth century and shared with his brother, Robin, the right of guld-riding district to fine or otherwise punish tenants who allowed carrgulds or corn marigolds to flourish upon the land.

Те слова, которые я выделил - непонятны для меня и хотелось бы понять их.

Вот, собственно, контекст: 

Riding the Black Knight was a lively Easter Monday custom which survived at Ashton in Lancashire until just the outbreak of the Second World War. The effigy of a knight in black armour and a black velvet cloak was paraded on horseback through the streets, accompanied by musicians and a company of young man, mounted or on foot, who represented the knight's retainers. The procession went round the town through the streets densely packed with spectators, and then to an open space, where the effigy was dismounted, pelted with stones and any other missiles, and finally shot to pieces with guns. According to the local tradition, the Black Knight represented Sir Ralph de Assheton who lived in the fifteenth century and shared with his brother, Robin, the right of guld-riding district to fine or otherwise punish tenants who allowed carrgulds or corn marigolds to flourish upon the land. Sir Ralph is said to have carried his duty with great severity and to have earned the hatred of the people thereby. Eventually, he was killed in the streets of Ashton by some aggressive person, which event the Riding is supposed to commemorate.

https://www.multitran.com/c/m.exe?a=4&MessNum=186667&l1=1&l2=2 .