Ep 1. Episode 1

Belgravia is a historical drama that is set in the upper-class district of Belgravia, London in the 19th century. The series revolves around the events that occur in the lives of the Trenchard and Brockenhurst families, whose lives intertwine in unexpected ways.

In episode 1, the viewers are introduced to the Trenchard family - James and Anne Trenchard, and their daughter Sophia. The Trenchards are nouveau-riche, having made their fortune through their dealings with the British army's supplies during the Napoleonic Wars. They are invited to a grand ball hosted by the Brockenhurst family, which consists of the Earl and Countess of Brockenhurst, their son Edmund, and their daughter-in-law Caroline.

Upon arriving at the ball, the Trenchards are treated with indifference by the snobbish upper-class guests, who view them as social climbers. However, James manages to impress the Earl of Brockenhurst with his knowledge of army supplies and is invited to join him for a game of cards. Meanwhile, Anne and Sophia are introduced to Lady Maria Grey, a sharp-tongued socialite, who is renowned for her wit and gossip.

During the course of the evening, a shocking revelation is made when Lady Maria confides in Anne about the true parentage of Sophia. Anne is bewildered as she had believed all along that Sophia was James and her own daughter. However, Lady Maria reveals that Sophia was in fact born to Edmund and his former lover, before his marriage to Caroline.

The episode ends with Anne overwhelmed by this revelation and James being accused of cheating at cards by Lord Bellasis, a wealthy and influential guest at the ball. The incident leads to a heated argument between James and Lord Bellasis, in which James defends his honor and reputation.

Overall, the premiere episode of Belgravia sets the stage for an intriguing tale of family secrets, betrayal, and social intrigue in the high society of 19th century London. The viewers are introduced to a diverse cast of characters, each with their own motives and hidden agendas, and the promise of further revelations and twists in the upcoming episodes.