Henry VI Part 2 (often written as 2 Henry VI) is a history play by William Shakespeare believed to have been written in 1591 and set during the lifetime of King Henry VI of England. Whereas Henry VI, Part 1 deals primarily with the loss of England's French territories and the political machinations leading up to the Wars of the Roses, and Henry VI, Part 3 deals with the horrors of that conflict, 2 Henry VI focuses on the King's inability to quell the bickering of his nobles, the death of his trusted adviser Humphrey, Duke of Gloucester, the rise of the Duke of York and the inevitability of armed conflict. As such, the play culminates with the opening battle of the War, the First Battle of St Albans (1455). Although the Henry VI trilogy may not have been written in chronological order, the three plays are often grouped together with Richard III to form a tetralogy covering the entire Wars of the Roses saga, from the death of Henry V in 1422 to the rise to power of Henry VII in 1485. It was the success of this sequence of plays that firmly established Shakespeare's reputation as a playwright. Henry VI, Part 2 has the largest cast of all Shakespeare's plays[a] and is seen by many critics as the best of the Henry VI trilogy.