Robin Hood was an outlaw who robbed from the rich and gave to the poor. King Richard was the king. Robin Hood was seen as a hero by the common people. He fought against the corrupt Sheriff of Nottingham who misused his power. King Richard, when he returned from the Crusades, had different views on justice. In some versions, he eventually pardoned Robin Hood for his deeds because he recognized that Robin Hood was actually promoting a kind of rough justice in the land where the rich were oppressing the poor.
In the story, King Richard is often seen as a somewhat absent but noble figure. Robin Hood, on the other hand, operates in the king's realm. Robin Hood is like a champion of the people in the absence of the king. He redistributes wealth that has been wrongly taken from the poor, and in a way, he might be seen as doing what he believes the king should be doing if the king were there to oversee justice properly.
The story had several important events. Robin Hood's decision to become an outlaw was a significant start. He formed his band of Merry Men in Sherwood Forest. King Richard was away on his Crusade journey, leaving the kingdom with a power vacuum. The Sheriff of Nottingham took advantage of this and was very cruel to the people. Robin Hood constantly thwarted the Sheriff's plans. When King Richard returned, he found out about Robin Hood. There were different reactions among the people and the nobles. Eventually, King Richard had to decide what to do with Robin Hood, and this decision had a great impact on the future of the kingdom and Robin Hood's legend.
There are fanfictions that revolve around his role in 'North and South'. Some of these might explore what could have happened after the end of the series. Maybe his character, Mr. Thornton, has new business ventures and how that affects his relationship with Margaret. Also, there are likely fanfictions that put him in a fantasy adventure not related to his known roles, where he has special powers and has to save a magical world.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can use the search function to specifically look for Richard Armitage fanfiction. You can also sort by popularity, kudos, or comments to find the ones that are well - liked by other fans.
Definitely fiction. Robin Hood's adventures are part of folklore and imagination. There's no historical evidence to prove his existence as depicted in the stories.
Robin Hood's story is a reaction to King Richard's rule. While King Richard is off at war, the kingdom is mismanaged by his nobles. Robin Hood steps in to help the poor who are being oppressed. His actions are a form of resistance against the unjust rule in the king's absence.