The first trial from the phone-hacking scandal that sank Rupert Murdoch's News of the World has opened with his aide Rebekah Brooks and Andy Coulson, UK prime minister's former media chief, in the dock.
They are among eight defendants facing a jury for the first time over the scandal two years ago that rocked the British newspaper industry.
Brooks, 45, arrived at the Old Bailey court in London accompanied by her husband Charlie, a racehorse trainer, who is also on trial.
Coulson, also 45, arrived with his legal team.
The defendants face charges ranging from illegally hacking the mobile phone voicemails of 600 people including a murdered schoolgirl and celebrities such as Paul McCartney and Jude Law, plus bribing public officials for stories and hiding evidence.
The trial was originally scheduled to last four months, but due to its complexity it could now run for six months.
The jury is expected to hear explosive testimony about the scandal that forced Australian-born Murdoch to shut down the News of the World in disgrace in 2011, and threatened to drag in David Cameron's government.
The trial formally opened on Monday, but the prosecution's opening statement is expected to come later in the week as the day will be taken up with jury selection.
The main players are Brooks, the former chief executive of Murdoch's British newspaper operations, and Coulson, the tabloid journalist who became director of communications for Cameron.
Brooks, who rose from a secretary to edit the News of the World and its daily sister paper The Sun and became one of Murdoch's closest confidantes, denies phone hacking, conspiracy to commit misconduct in a public office, and perverting the course of justice.
Her 50-year-old husband, her personal assistant Cheryl Carter, 49, and Mark Hanna, former News International security chief, deny obstructing justice along with Brooks herself by concealing evidence in the frantic last days of the News of the World.
Coulson, also a former News of the World editor, denies hacking and paying officials for a Buckingham Palace phone directory containing contact details for senior royals.
Also on trial are former News of the World managing editor Stuart Kuttner and head of news Ian Edmondson, who both deny phone hacking.
The final defendant is Clive Goodman, the paper's royal editor, who is charged along with Coulson for bribing officials and also pleads not guilty.
A public inquiry ordered by Cameron and led by judge Brian Leveson heard evidence on the scandal, but it is the first time that criminal charges will be put to the alleged key players.
A second trial involving several Sun journalists accused of bribing officials will take place next year.
The scandal erupted in July 2011 with revelations that the News of the World had hacked the mobile phone voicemails of Milly Dowler, a missing 13-year-old girl who was later found murdered, and led to the closure of the paper after 168 years in print.
At the time of the hacking revelations, Conservative leader Cameron faced questions about his employment of Coulson, who was his media chief from 2007 until 2011, as well as his friendship with Brooks and her husband.
The eight people on trial are among dozens arrested as part of a huge, multifaceted police investigation into criminal practices by Britain's famously raucous press.
Murdoch's New York-based News Corp has paid out millions of pounds to hacking victims and faces more financial claims.
Murdoch has divided News Corp into two companies, separating the television and film business from the newspaper and publishing arm.
Britain's newspaper industry is fighting the introduction of tough regulatory measures in the wake of the Leveson Inquiry.
The papers are threatening to take legal action to challenge the government's plan for a press standards body backed by a so-called royal charter.
They say the plan is tantamount to state regulation of the press.