George Villiers was a man with a past. A favorite of James I (of England) and VI (of Scotland), his rise to rank and power had been "meteoric." Not a few people speculated (and gossiped) about his real relationship with the king (whose mother was the executed Mary, Queen of Scots). Surviving letters from James I/VI to Villiers add credence to such rumors.
When the king created a special peerage for Villiers, conferring on him the new landed title of Duke of Buckingham, many people were upset. Near the end of his life, James had effectively given Buckingham the power to run England. Disregarding the concerns of Parliament, the king alienated his subjects. It is said he was “unlamented” when he died in 1625.
After Charles I took the throne of England and Scotland, following his father’s death of a stroke, Buckingham’s influence continued. So did problems with Parliament whose members were upset with flagrant royal spending and bad foreign policy. Adding to the trouble was the king’s arranged marriage to Henrietta-Marie, the 15-year-old daughter of Henri IV and Marie de Medici. A devout French Catholic, the new queen was not a welcome addition at the English court.
Buckingham, meanwhile, continued to exert influence (mostly bad) and amass wealth and power (including lands in Ireland). His marriage to Lady Katharine Manners (the richest heiress in England) produced a son (George, later the 2nd Duke of Buckingham) and a daughter (Mary), but it wasn’t a good match. It is said that Buckingham commissioned a painting by Sir Anthony Van Dyck to reflect the sad state of the Villiers’ marriage.
When Charles I decided to help the Huguenots of La Rochelle, he sent Buckingham (referred to in Parliament as the "grievance of grievances") to lead the expedition. It was - to put it mildly - a disastrous move.