Shami Chakrabarti, the former Liberty director who carried out a controversial investigation into anti-Semitism in the Labour Party, has been appointed to the shadow cabinet.
Baroness Chakrabarti, who was made a life peer by Jeremy Corbyn after her report was published, is to be the new shadow attorney general, the Labour leader announced.
Corbyn also handed a major promotion to his long-time ally Diane Abbott, making her shadow home secretary, as he began reshuffling his top team in the wake of his leadership victory.
Sir Keir Starmer, the former head of the Crown Prosecution Service who stormed out of the shadow cabinet in June, has been invited back as shadow Brexit secretary - a move that will bring on board one of the major moderate figures in the party.
In a surprise move, the Labour leader made veteran Nick Brown - a long-standing ally of former leader Gordon Brown - chief whip, replacing Rosie Winterton after six years in the role.
Clive Lewis, who only became an MP for the first time last year, has risen sharply through the ranks - from shadow defence secretary to shadow business secretary, replacing Jon Trickett.
Corbyn has also appointed Sarah Champion to the role of shadow women and equalities minister, and Jo Stevens as shadow Welsh secretary.
Champion was one of dozens of Labour frontbenchers who quit in protest at Corbyn's leadership in June - only to ask for her job back a month later.
She was reinstated as shadow home office minister for preventing abuse and domestic violence and received Cobyn's backing after she admitted she "lost control" and ended up in a police cell during an argument with her ex-husband back in 2007.
With Dawn Butler given the shadow minister for black and minority ethnic communities portfolio, Corbyn said: "I am delighted to announce the appointment of Dawn to my shadow cabinet. I am very proud that the Labour Party now has five MPs in our shadow cabinet from the BAME community - the highest number ever in any cabinet or shadow cabinet."
With shadow chancellor John McDonnell expected to stay in place as shadow chancellor, and Emily Thornberry likely to retain the foreign affairs brief, the four most senior positions in the body will all be held by London MPs.
In a bid to stress regional balance in the top team, Corbyn said the appointment of Jonathan Reynolds to the role of shadow economic secretary to the treasury meant there were 10 MPs from the north of England on the front bench.
The former shadow transport minister was another frontbencher to quit his role before later indicating his willingness to work with Corbyn again.
Trickett has been moved to shadow Lord President of the Council and Labour's national campaigns co-ordinator, and Nia Griffith becomes shadow defence secretary.