Happy Birthday: Michel Eyquem, Seigneur de Montaigne (28 February 1533 – 13 September 1592), commonly known as just Michel de Montaigne, was one of the most significant philosophers of the French Renaissance. He is known for popularising the essay as a literary genre. His work is noted for its merging of casual anecdotes and autobiography with intellectual insight. Montaigne had a direct influence on numerous writers of Western literature; his Essais contain some of the most influential essays ever written.

During his lifetime, Montaigne was admired more as a statesman than as an author. The tendency in his essays to digress into anecdotes and personal ruminations was seen as detrimental to proper style, rather than as an innovation; moreover, his declaration that "I am myself the matter of my book" was viewed by his contemporaries as self-indulgent. In time, however, Montaigne came to be recognised as embodying the spirit of critical thought and open inquiry that began to emerge around that time. He is best known for his sceptical remark, "Que sçay-je ?" ("What do I know?", in Middle French; "Que sais-je ?" in modern French).

Montaigne's humanism is expressed in his Essais (published in 1580), a large collection of short, subjective essays on various topics; these essays were inspired by his studies in the classics, especially the works of Plutarch and Lucretius. Montaigne's stated goal was to describe humans, and especially himself, with complete frankness.

Inspired by considering the lives and ideals of leading figures of his age, Montaigne finds the most basic feature of human nature to be its great variety and volatility. He describes his own poor memory; his ability to solve problems and mediate conflicts without getting deeply involved emotionally; his disdain for the human pursuit of enduring fame; and his attempts to detach himself from worldly things to prepare for his approaching death. He also writes about his disgust with the religious conflicts of the time. He believed that humans are unable to attain true certainty. The longest of his essays, Apology for Raymond Sebond, marks his adoption of Pyrrhonism and contains the famous motto, "What do I know?"

Montaigne considered marriage necessary for raising children, but he disliked feelings of passionate love, because he saw them as detrimental to freedom. In education, he favored concrete examples and experience over abstract knowledge that is intended to be accepted uncritically. His essay "On the Education of Children" is dedicated to Diana of Foix.

The Essais exerted a significant influence on both French and English literature, shaping thought as well as style. Francis Bacon's Essays, published more than a decade later (first in 1597), are usually assumed to reflect direct influence by Montaigne's collection, and Montaigne is cited by Bacon alongside other classical sources in later essays.