Rashid was accused sharing an image of the eldest son of Prince William and Kate Middleton, along with the address of his school in Battersea, London, to fellow extremists via the encrypted messaging service Telegram.
About a month later, Husnain Rashid, a 32-year-old from Nelson, Lancashire, encouraged Islamist militants to attack the 4-year-old, posting a photo of him at school with two masked fighters superimposed over it.
Almost two weeks into his trial Rashid was re-indicted and pleaded guilty to three counts of engaging in conduct in preparation of terrorist acts and one count of encouraging terrorism. Husnain Rashid, 32, has now admitted to encouraging terrorism.
Prosecutor Annabel Darlow told the jury Rashid suggested a range of attacks, including injecting poison into supermarket ice cream and targeting Prince George. And if that's not chilling enough, he wrote, "even the royal family will not be left alone".
Husnain Rashid, 32, from Lancashire in the United Kingdom, changed his plea two weeks into a trial for multiple terrorism offences, after originally denying all the allegations against him.
He will be sentenced at Woolwich Crown Court on June 28.
Following Rashid's revised plea, Judge Andrew Lees said the trial had heard the "most disturbing allegations" and told Rashid a very lengthy prison sentence was "inevitable" and a life sentence would be considered. His Telegram channel was called the "Lone Mujahid," and he posted instructions on how to make poison and bombs.
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Rashid also encouraged followers to poison ice cream and attack football stadiums, and was even planning his own online magazine offering tips for "lone-wolf attacks".
His list of targets were wide-ranging - including British Army bases, shopping centres, Jewish communities and Government buildings.
He also made plans to travel to Turkey and Syria to fight for IS, according to the Crown.
He had also provided information about how to shoot down aircraft and jam missile systems to an individual already in Syria, according to the CPS.
Rashid then posted a photograph of the Burmese ambassador to the United Kingdom, saying: "You know what to do".
The BBC reports that when police finally swooped on his house Rashid hurled a phone containing a "treasure trove" of evidence over a wall into an alleyway.