Conrad Black's worldwide media empire once included the Chicago Sun-Times, Britain's Daily Telegraph and the Jerusalem Post.
In 2007, Black was convicted of three counts of fraud and one of obstruction of justice in a Chicago court and sentenced to six and a half years in jail - more than twice the sentence handed to David Radler, his longtime partner who agreed to testify for the prosecution.
Shortly after the pardon was announced, Canada's National Post published an article from Black in which he continued to take issue with his conviction and said he was "at last, officially not guilty even in the conviction-mad United States".
Lord Conrad Black, the former owner of The Daily Telegraph, has received a full pardon from President Donald Trump. The White House said the experience "changed his life" and formed his later career as a conservative advocate for criminal justice revisions, including with the First Step Act, the criminal justice bill Trump signed into law previous year.
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"My long ordeal with the US justice system was never anything but a confluence of unlucky events, the belligerence of several corporate governance charlatans, and grandstanding local and American judges", Black wrote.
He wrote a column Thursday in Canada's National Post describing how Trump called him and revealed the pardon.
A jury found Lord Black illegally received 3.5 million dollars (£1.75 million) as they convicted him of three counts of fraud and one of obstruction at the Dirksen Federal Courthouse in Chicago, Illinois.
She said Black's case attracted broad support from many high-profile individuals - including former US Secretary of State Henry Kissinger, Elton John and Rush Limbaugh - who have "vigorously vouched for his exceptional character". The statement also noted that Black is "the author of several notable biographies", but didn't mention the glowing book Black published about Trump previous year.
Trump has used his power of pardon before this and critics say he does it for people who back him or his ideas.
A description of Black's book on Trump compared it to two other presidential biographies he had written and said that this time around Black had turned "his attention to his "friend" President Donald J. Trump". "He said that there would be some controversy, "but you can handle that better than anyone".