I hate to go against fellow flaired user /u/DonaldFDraper, but I think he really undersells Lafayette's role in the French Revolution.

Layfette exemplifies the quandary that many liberal-minded aristocrats of France faced during the Revolution - one on hand, he espoused the ideas of the Englightment, but was horrified when these ideas unleashed a bloodbath and the near-total upheaval of the social order.

Lafayette's first dealings with the Paris mob came immediately after the fall of the Bastille in 1789. After the mob organized themselves into a National Guard, they reached out to Lafayette to offer him command of the impromptu army. Though horrified by the outrages the mob had committed, Lafayette accepted command, hoping to help restrain the worst impulses of the people. To symbolize this, the Marquis insisted on adding Bourbon white to the blue and red cockades adopted by the Guard, thus forming the iconic colors and pattern of the Tricolor. Lafayette also contributed, with Thomas Jefferson, to the Declaration of Rights of Man and Citizen during this period, one of the founding texts of the French Revolution.

Wrangling both the National Guard and the increasingly radical politics of the Revolution proved difficult for the Marquis. The Guard was effectively powerless to stop mob's March to Versailles, and Lafayette was one of the few that suggested that the King Louis leave Versailles and follow the mob back to Paris.

It appears that Lafayette's loyalties shifted from the mob to the king at this point, as Lafayette began to encourage and organize plans for the king to flee the country. The royal family's arrest at Varrenes caused both the final collapse of royal authority and war with Austria. The Marquis was given command of a wing of the French Army in 1792, but quickly found the radicals in France to be unsavory. He abandoned his command with several staff officers and fled to the Netherlands, where was he arrested by Austrian troops. He spent the next five years in Austrian prisons, followed by another two in exile, before returning to France a weary, if not broken, man. Lafayette spent the years of the Empire in retirement at a country estate, doing his best not to raise Napoleon's suspicion and jealousy.

IMMEDIATE AND REGRETTABLE EDIT: I THOUGHT THE QUESTION WAS "WHAT DID LAFAYETTE DO DURING THE FRENCH REVOLUTION. Oh well. At least someone might get a kick out of reading this?

Sources: Robert Harvey, War of Wars

Honestly, not very much. The Marquis de Lafayette is more of a Revolutionary figure that spoke for liberty and freedom rather than the more Imperial rule of Napoleon. As a result of the Hundred Days, he was elected to the Chamber of Representatives and called for the abdication of Napoleon after his defeat at Waterloo.

With Napoleon in power, there isn't as much room for Lafayette to be a Revolutionary that he is and isn't a continuation of the Revolution.

Edit: fixed a few grammatical errors.