Teenager Muhammad Amirul Azwan Mohd Shakri has been sentenced to one year in prison term after pleading guilty to 14 counts of making insulting comments against the Johor crown prince Tunku Ismail Sultan Ibrahim.

Amirul, 19, pleaded guilty to all the charges read against him in front of the Johor Baru Sessions Court judge Sabariah Atan, as reported by Sinar Harian today.

According to the charge sheet, the teenager from Tumpat, Kelantan was alleged to have made those insulting comments through Facebook under the pseudonym 'Miyo Castello' between March and April with the intention to offend Tunku Ismail.

He was charged under Section 233 of the Communications and Multimedia Act 1998, where upon conviction, one can be fined not more than RM50,000 or jailed not more than one year or both.

Amirul, who works as a labourer, had requested in his appeal for the court to lighten his sentence as he is from a poor family and promised not to commit the offence again.

However, deputy public prosecutor Nor Azizah Mohamad asked the court to give him a harsher sentence as it is a serious offence of contempt against Tunku Ismail, who will become the next Johor sultan.

Sabariah then sentenced the teenager to a one-year jail term from the date he was arrested on April 28.

A number of people have been arrested in the last two weeks for allegedly posting rude remarks against the crown prince, though Tunku Ismail had later asked the police not to arrest his critics.

"I would humbly share my opinion with the police not to arrest anyone making seditious remarks about me.

"Give them the privilege of saying what they want to say to my face, man to man," he had said.