— Monis' former lawyer says that he believes the hostage-taker is acting alone but that his views have made him at times irrational. "His ideology is just so strong and so powerful that it clouds his vision for common sense and objectiveness," the lawyer told reporters.
— Monis previously achieved minor infamy in Australia for sending letters to the families of soldiers who had died fighting in Afghanistan, telling the families that their loved ones were murders. He sent a similar letter to the family of an Australian trade official killed in a Jakarta hotel bombing.
— Since the hostage crisis began, Monis has demanded a platform for his views. This has allegedly included having hostages call a local radio host to request air time.
— He was previously a Shia Muslim, as are most Iranians, but later converted to Sunni Islam and changed his name from Mohammad Hassan Manteghi Bourjerdi to Man Haron Monis.
— There are a number of videos of Monis. Some show him speaking to reporters after his letters to the families of soldiers. Others are of his sermons.
Martin Place siege Man Haron Monis has long history of hatred of politicians In a letter to Mr Abbott on November 1, 2013, Monis wrote – in what can now be seen as a chilling portent of Monday's siege - attacked the Prime Minister for declaring Australia's mission to Afghanistan over during a visit to Tarin Kowt military base.
Monis argued that Australia's policy in Afghanistan "has a significant role in jeopardising security and peace in the world especially in Australia", challenged the Prime Minister to a debate about the Afghan war and promised to support government policy if he lost the debate.
"However, if it is proven in our debate that the government's policy endangered Australia, if it is proven the government made Australia unsafe, if it is proven that Australia and Australians will be attacked, in that case I expect you to change the Australia's (sic) policy."
Monis last week praised the Islamic State group for its provision of services in Syria and Iraq – though most experts say that such services are largely used for propaganda and in fact the group predominantly terrorises local populations.