LONDON — Tommy Robinson, the jailed British far-right activist backed by the former Trump aide Stephen K. Bannon but reviled by others who call him a violent purveyor of hate, was ordered to be freed on bail Wednesday, after challenging his conviction for contempt of court.

Mr. Robinson was arrested in May after he live-streamed a video from outside a criminal trial in Leeds, England, which had a news media blackout, revealing the defendants’ identities. He was sentenced to 13 months in prison for contempt of court, provoking an international outcry in far-right circles.

On Wednesday, the Court of Appeal ordered his release, pending a new hearing in his case. The court questioned the speed with which he had been tried and convicted, noting that it took five hours from the time of his arrest to a conviction.

Who is Tommy Robinson?

Anti-Muslim Activist

Mr. Robinson, whose real name is Stephen Christopher Yaxley-Lennon, is the founder of the English Defense League, an anti-Islam and anti-immigration movement known for violent street protests.