King Adrian IV was born the younger son (by far) of King Julian II's younger brother, Alexander I. He was born to his father's young second wife, who's identity to this day is shrouded in doubt. Public records state that the Alexander's second wife died in childbirth because of a weak constitution, but other, more sinister rumors still float around. After all, she was supposedly a commoner (albeit a very beautiful one), and the old Prince's love for the girl was somewhat short-lived. On top of that, Alexander's first wife was also eliminated through assassination.
Either way things went, Alexander quickly grew to loathe his younger son, seeing him as a potential threat to a stable line being established through him. When his eldest son, Julian III, had his first child -- a son, he took measures to ensure that his grandchildren were not anywhere near this threat. Thus, Adrian was sent away from the Palace at the age of 10 (an unusual move) in order to earn the basic arts of nobility, to include archery, foreign languages, and battlefield tactics.
During this time, the old, infertile King Julian II died at the age of 70, having no direct descendants to succeed him. Thus, Adrian's father took the throne as King Alexander I. Using his power, he drove his 12-year-old son further away from the Throne by cutting off his communication with nobles that might have given him their support. This drove an irreparable rift between Adrian and his father.
It wasn't long until the Navy had their way with the boy. At the age of 14, he was sent to study with the military directly, rather than remain in the Palace, like most other Princes. The Navy, all too eager to shape a member of royalty to their own model, took him in and wasted no time in turning this young man into an able military commander. By the time the boy was 18, he was about as able as the best naval admirals of the day, holding that same rank on his own. Thus, the Navy's top brass gained a direct supporter within the Royal Family.
His rapid rise through the ranks wasn't ignored by his father, who attempted to recall him home, in an effort to separate him from his new position of power. However, the Navy refused, in a show of defiance promoted Adrian yet again to its highest rank, at the unheard of age of 19. Thus, as the Navy's commander, he was given the Supreme Commander's quarters... right outside of the Palace.
After two years of tension, he threw a gala in his family's honor, to ease their strained relationship with one another. His father and brother attended the event, leaving the King's two grandchildren at the Palace. Unfortunately, a cupbearer attempted to poison Adrian's food, and in turn his guests'. In the resulting disaster, Adrian barely escaped with his life, after being administered an antidote by a nearby medical officer. His father and brother though, weren't so lucky.
Shortly after the death of both King Alexander and Crown Prince Julian III, that left only Adrian's 10-year-old niece, and his 8-year-old nephew in the line of succession before himself. A brief struggle for the Throne began, while his father's death was still being investigated. Adrian was quickly exonerated (along with the shady military officers backing him), and the blame was cast on the foreign Catholic Church, due to the old King's strongly pagan beliefs.
In the meantime, the nobility's support for the young Prince Julian IV and Princess Margaret eroded, in the face of the military's overwhelming support of Prince Adrian. The struggle came to an end when Adrian finally ordered a blockade of the Palace, cutting off supplies to the heavily defended residence.
The struggle ended anticlimactically, when the Royal Guard decided to yield to Adrian's superior forces, handing over both the would-be King Julian IV and his sister, along with their supporting nobles. He stripped the enemy nobles of their lands and titles, giving them to his highest-ranking officers as a reward for their loyalty. However, he was kinder to his niece and nephew, promising them their own fiefs in return for their loyalty.
Thus, he found himself being crowned King Adrian IV, and with the military backing him, as well as the noble remnant having been subdued, his reign has been very prosperous and secure, to the point where he is able to venture outside of the Kingdom on matters of state.
Religious Views: Currently, King Adrian is on the fence about his religious views. He's been seeking into most major and minor faiths in both his kingdom and on the mainland, in a search to see which one is most worthy of his (and by consequence his people's) devotion.
Hence, he is spiritually open, and some view this as a sign of weakness on the part of the King. However, others see it as a sign of strength on part of His Majesty, stating that only a weak and hard-hearted King would be completely closed to new ideas.