Radical preacher Anjem Choudary will make his first Crown Court appearance later accused of encouraging support for Islamic State on social media.
The 48-year-old was arrested by Scotland Yard's counter-terrorism command last year and charged earlier this month.
It is alleged that between June 29 last year and March 6 this year, Choudary invited support for the proscribed organisation Isil, also known as Isis or Islamic State, contrary to section 12 of the Terrorism Act 2000.
It is claimed that he encouraged support for the banned terror group in social media posts on the internet.
Choudary, of Hampton Road, Ilford in east London, is charged along with Mohammed Rahman, 32, of Sidney Street in Whitechapel, east London, who is also accused of inviting support for IS over the same dates.
Both men are in custody and are expected to appear before Mr Justice Saunders at the Old Bailey via video link from 10.30am.