When Mr Johnson came to power, his first task was to get to grips with Brexit
He got a deal, but not before multiple failed votes in the Commons, an extension he'd rather "die in a ditch" than ask for, and, eventually, an election, to get it passed bbc.in/3htOTeX
The UK left the EU on 31 January
Trade negotiations between the two sides began in March, and are due to be completed by the end of 2020 bbc.in/3htOTeX
While Westminster was on its summer break last year, Mr Johnson announced plans to prorogue Parliament within days of its return until 14 October
But MPs criticised the lengthy closure, accusing him of avoiding scrutiny bbc.in/3htOTeX
Eventually, the matter ended up in the Supreme Court, and Lady Hale ruled Mr Johnson's action was "unlawful" bbc.in/3htOTeX
When Boris Johnson became PM, the Tory majority was slim, and he needed Commons support to pass his plans
He needed two-thirds of the Commons’ support to call a general election, and it took four attempts to finally pass bbc.in/3htOTeX
The UK held a general election on 12 December 2019, the first December election since 1923
The Conservatives secured an 80-strong majority, slightly more seats than Tony Blair held in 2005 bbc.in/3htOTeX
In early 2020, the first few cases of coronavirus were confirmed in the UK
In March, Mr Johnson addressed the nation, calling on them to “stay at home, protect the NHS and save lives” bbc.in/3htOTeX
Mr Johnson tested positive for coronavirus, and was hospitalised by its effects, spending time in intensive care
But, after a few weeks recuperating at Chequers, he was back at Downing Street bbc.in/3htOTeX
Mr Johnson was praised for the Nightingale hospitals, sourcing ventilators and the furlough scheme
But has been criticised for failed testing targets, strategies for care homes, missing PPE supplies, and choosing to stand by top aide Dominic Cummings bbc.in/3htOTeX
The PM has also contended with other hot topics over the past year, including the UK’s relationship with Huawei and the newly-released Russia report bbc.in/3htOTeX
When he moved into Downing Street with girlfriend Carrie Symonds, they became the first unmarried couple to ever live at number 10
In the last year, Ms Symonds has given birth to their first child, Wilfred Lawrie Nicholas, and the pair have become engaged bbc.in/3htOTeX
Under the Fixed Term Parliaments Act, Mr Johnson has five years in charge, and there’s a lot more for him to contend with, not least the ongoing coronavirus pandemic and Brexit
With a week to go until the deadline for applying for the EU Settlement Scheme, there have been about two million more applications than the previous official estimates for the number of EU nationals living in the UK
In many areas, including parts of West Sussex, Wolverhampton and numerous London boroughs, the number of applicants was more than 80% higher than the estimated local population of EU nationals
Theresa May said breaking international law would damage "trust" in the UK
"How can the government reassure future international partners that the UK can be trusted to abide by the legal obligations of the agreements it signs?"
From telecoms, to test and trace, and now England's new public health agency - Dido Harding looks set to become one of the most powerful unelected officials involved in the fight against coronavirus
For the past three years, she has been chair of NHS Improvement
Prior to that, she's had roles at Thomas Cook, Sainsbury's and Tesco and was chief executive of TalkTalk - but stepped down in the wake of a high-profile and damaging data breach
Baroness Harding was made a peer in 2014 by then prime minister David Cameron
The pair studied politics, philosophy and economics at Oxford at the same time
Her husband is Conservative MP John Penrose - who served as a culture minister under Mr Cameron bbc.in/3iTYDQf
The Conservative MP, who quit as chancellor in February after being told to sack his advisers, has accepted a job as senior adviser with the bank bbc.in/3kVQT1Z
MPs are allowed to take on second jobs
But for ex-members of the government, like Mr Javid, taking on paid work is slightly trickier bbc.in/2Q3ckzZ