Jon Arryn the Second

Jon Arryn II was the first king after Bran the Broken. He is described by scholars as an expert diplomat but gruesomely ineffective ruler and a cunt.
Early life and lordship
Jon Arryn decended from the line of Sweetrobin. According to some maesters, this meant he really didn't have a chance to begin with. His lordship over the vale was marked by an increase in border fortifications and the exploiting of new silver mines around the region. Although this meant a short-term increase in income, the mines at the high altitudes of the Vale were a gruesome task to excavate. The new fortifications, although impressive, largely crubled due to inattention after his ascention to the throne. 
The first clash of kings
Jon Arryn II was one of the schemers in, and the victor of, the first clash of kings. After the new reality of warfare was demonstrated on the exeptionally bloody battles in the fords of the Trident Union, Jon Arryn became filled with resolve to save his people from this war. Then, he immediately attacked the communists as soon as their defenses started to crumble. 
The second stage of the clash was marked by more shrewd diplomacy. In a manoeuvre some would consider "a dick move", he reached an accord with the Crusader Queen of the Crownlands and the Lord of the Iron Islands, he was crowned King just before the great tournament at kings landing took place. Some historians applaud him for supposedly saving many lives by doing so, but most historians despise him because he rid them of some excellent history. 
The weak reign
Jon Arryn II and his remarkably old son moved into the Red keep with greatly deminished strength, spending all their gold on the boosting of their prestige instead of reigning. This led to dissent among the lords, who plotted to overthrow him from the start. The first blow was dealt as Jon Arryn sanctioned a crusade into the Trident Union, which was seen by many as folley. This turned out to be a wise stance, as both the crusaders and commonfolk were whitteled down by the thousands in a bloody final battle which would become known as the Slaughter at Harrenhal. When the last of the crusaders was killed, this turned out to be the son of Jon Arryn II, who was sent to kill Joseph Dondarrion, leader of the Trident Union. 
Jon Arryn II would soon meet the same fate, as he was mysteriously cast of the great Red Keep into the spiked pits below. This tragic event happened a mere two and a half years after the start of his reign, and would mark the start of the second clash.