HE WROTE letters to the Pope and former UN secretary-general Kofi Annan, but it was his creepy birthday message to the Queen that has been most shocking.

Sydney siege gunman Man Haron Monis not only penned a letter to Her Majesty but also posted a bizarre greeting on his website wishing Queen Elizabeth “Happy Deathday!”.

The disturbing message is one of dozens of incoherent ramblings left by the self-proclaimed Islamic sheik on his website, details of which were shown yesterday during the opening day of the inquest into December’s Lindt Cafe killings.

The inquiry was told that Monis was a man who had a history of mental illness, was constantly striving for power and used a “spiritual healing” business he set up to prey on vulnerable women.

He had changed his name twice and made “grandiose claims” about his background — the most notable was “that his father was an Ayatollah”.

It was also revealed he tried to join the Rebels Motorcycle Club but was rejected because they thought he was “weird”.

The inquiry heard that Monis enrolled in, but did not complete many courses including fitness instructing, lifesaving and criminology, that he was convicted for writing offensive letters to the families of dead Australian soldiers and that he made $125,000 a year from his “spiritual healing” and clairvoyance businesses.

In 2014, he was charged with 43 counts of aggravated or indecent sexual assault relating to clients of his healing business.

But it was his letters and messages on his website that expose the real extent of his delusions.

Monis wrote to the Pope requesting an audience with the Holy See to discuss the ‘truth’ surrounding Easter, claiming Jesus never died on the cross.

“They hide the truth from the people, the truth that Jesus (peace be upon him) never died on the cross, nor ever wanted to die on the cross, nor ever was born to die on the cross,” Monis wrote.

Using one of his aliases, he wrote to Kofi Annan asking the former UN secretary to “take urgent action against” Iran citing the refusal of his daughter’s visas to live in Australia as an act of “oppression”.

In his letter to the Queen, he asks Her Majesty “not to be silent” on Australia’s “many problems”.

“I believe I have right to share the problems with the Queen, and I respectfully expect you to pay attention to these problems, answer my questions, find a good solution and advise the Australian authorities for making Australia a better country,” he wrote.

He says Australia had “many problems” including race and religious discrimination, police corruption and a “recklessness to terrorism” as well as having “allowed non Muslim terrorism”.

“Australia needs your advice to be a better country, why are you silent?”

The inquest into the tragic event will not only examine what happened during the 17-hour ordeal and whether it could have been prevented, it will consider whether the siege was an act of terrorism.

It will examine Monis’ criminal past and how he was granted bail.

Around 100 witnesses — including hostages — are expected to be called to give evidence over the course of the inquiry, however the hostages will not be called until later in the year.

The inquest will continue today with witnesses expected to give evidence on Monis’s early employment and his dealings with immigration and customs.