Kevin Guiavarch, a 24-year-old who converted to Islam 10 years ago, was one of the UN's most wanted jihadists and had been placed on a blacklist in 2014.
Suspected as being one of the major Islamic State group recruiters attracting young French people to join the jihadist cause in Syria and Iraq, Guiavarch rubbed shoulders with some of the perpetrators of the November 2015 Paris attacks while living in Raqa, IS's de facto capital.
He spent four years in Syria amongst jihadists, first with former Al-Qaeda affiliate the Fateh al-Sham Front, and then IS.
He quit Syria in June 2016 with his four French wives and six children, and went to Turkey where they were all arrested.
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All four wives had already been deported to France.
Guiavarch, who had been the subject of an international arrest warrant, arrived in the French capital last night before today being charged with association of a criminal terrorist organisation and financing terrorism, the Paris prosecutor said.
What to do with returning jihadists -- whether claiming to be reformed or not -- is a major concern for many European countries.
Authorities say around 700 French people are living amongst IS militants in either Syria or Iraq. Another 200 have been killed.
By January 1, some 350 people in France had been charged with jihadist offences while another 710 are being investigated.
Since 2012, 83 people have been sentenced over jihadist activities.