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Rudolph Giuliani was the Republican mayor of New York City between 1994 and 2001. By the end of his second term in office he became lauded as the politician who led New Yorkers through the Sept. 11 terrorist attacks on the World Trade Center — and the man would not let you forget it.

Giuliani, 72, is set to speak Monday for the opening night of the Republican National Convention in Cleveland, where the party is expected to officially name Donald Trump and Mike Pence as the Republican presidential ticket. 

The top job is something Giuliani sought in 2008; he emerged as the primary frontrunner before suspending his campaign to endorse Sen. John McCain (R-Arizona), the eventual nominee. The former mayor also ran for Senate against now-presumptive Democratic nominee Hillary Clinton before suspending his campaign due to a prostate cancer diagnosis.

Here are five facts about Giuliani in the lead-up to his RNC speech:

Mayor Rudy Giuliani attends a memorial mass for the victims of the Sept. 11, 2001, terror attacks in New York City, just days after planes crashed into the World Trade Center.Source: Joe Raedle/Getty Images
Mayor Rudy Giuliani attends a memorial mass for the victims of the Sept. 11, 2001, terror attacks in New York City, just days after planes crashed into the World Trade Center.  Joe Raedle/Getty Images

1. Following 9/11, he raked in honors for his leadership.

Critics of Giuliani have said he let the praise of his leadership after the attacks go to his head. But it's not difficult to understand why the praise might have inflated his ego: In 2001, he was named Time person of the year, and he went on to be honorarily knighted by the queen of England the following year.

Rudy Giuliani and wife Judith Nathan in 2008Source: Gerald Herbert/AP
Rudy Giuliani and wife Judith Nathan in 2008  Gerald Herbert/AP

2. An extramarital affair nearly took down his political career.

New York City may have been billed for some costs of Giuliani's extramarital affair, according to documents obtained by Politico, the New York Times reported in 2007. While he was still married to Donna Hanover, Giuliani reportedly billed costs of his security detail through city agencies unrelated to the trips or security. 

The billing reportedly included trips to Southampton, New York, where his then-girlfriend, now-wife, Judith Nathan, had a condo, according to the New York Times. The spending scandal emerged as Giuliani faced criticism over his fiscal leadership, ahead of his 2008 presidential run.

Donald Trump and Rudy Giuliani in July 2016Source: Seth Wenig/AP
Donald Trump and Rudy Giuliani in July 2016  Seth Wenig/AP

3. He once dressed in drag and played hard-to-get with Donald Trump.

And there's video of it:

Source: YouTube

4. Politically, he's to the left of many of his fellow Republicans on same-sex marriage.

Giuliani has gone on the record saying his support for same-sex marriage would have been his biggest obstacle to winning the Republican presidential nomination, according to Gay Star News. He had long supported civil unions, before same-sex marriage became legal in New York state in 2011.

As his views evolved on the issues, he reportedly promised to officiate the same-sex marriage of a longtime friend, a promise he later broke, the New York Post reported in 2011.

Rudy Giuliani in New York CitySource: Bryan R. Smith/AP
Rudy Giuliani in New York City  Bryan R. Smith/AP

5. He has used problematic rhetoric to make a point about "black-on-black crime."

In recent weeks, Giuliani has trotted out anti-Black Lives Matter rhetoric in response to issues of aggressive policing in black communities. If more African-Americans would "teach your children to be respectful to the police," they would be less likely to die in encounters with officers, he suggested during a recent appearance on CBS' Face the Nation.

Not only is he wrong about that, he relies on an oft-debunked idea that black-on-black crime is the real problem in the black community. Republicans are gearing up to nominate a presidential candidate who has indicated he thinks the same thing.

July 18, 2016, 6:47 p.m. Eastern: This story has been updated.

Correction: July 18, 2016
A previous version of this story mischaracterized the knighthood Rudy Giuliani received, his reported relationship with Howard Koeppel and reporting done by Politico and the New York Times in 2007. Giuliani was deemed an honorary knight, Giuliani and Koeppel were described as friends and the New York Times, citing a Politico story, reported Giuliani billed city agencies for travel expenses related to his security detail. Additionally, this story previously misdescribed the role Giuliani played in a video with Donald Trump. Giuliani's character resists Trump's sexual advance.

Read more:
• Rudy Giuliani Slams Black Lives Matter in Wake of Dallas Police Shooting — But He's Wrong
• Rudy Giuliani Says Hillary Clinton Is a "Founding Member" of ISIS
• Rudy Giuliani Perpetuates a Dangerous Myth About Black Crime in America