Moroccan in custody for Facebook spoof
Fouad Mourtada, 26, was arrested on 5 February on suspicion of stealing the identity of Prince Moulay Rachid, younger brother of King Mohammed VI.
He has been in custody ever since his arrest in Casablanca.
A website supporting Mr Mourtada has published a letter addressed to the prince apologising for the incident.
The letter, which is said to come from Mr Mourtada's family, asks for clemency.
"Fouad Mourtada, like thousands of people who create fake profiles of well-known personalities or celebrities on Facebook, has in no way acted in a willingness to cause nuisance to Your Highness, for whom he has always shown the greatest of respect," the letter on the Help Fouad website reads.
He is accused of "villainous practices linked to the alleged theft of the [prince's] identity".
Earlier this week some Moroccan bloggers went "on strike", suspending their regular blog entries for 24 hours in protest at Mr Mourtada's detention.
Mr Mourtada's court appearance was initially set for 15 February, but was postponed for a week.
According to the website, he told family members who visited him in jail that he had been blindfolded and beaten unconscious at the time of his arrest.