**Answer:**

**Louis XVI** was throned in **1774**.

**Explanation:**

1. **Louis XVI:** Louis XVI was the last king of France before the French Revolution. He was born on August 23, 1754, and became the king of France on May 10, 1774, following the death of his grandfather, Louis XV.

2. **The French Revolution:** The French Revolution was a period of radical social and political upheaval in France from 1789 to 1799. It was during this time that the monarchy was abolished, and the country transitioned into a republic.

3. **Reign of Louis XVI:** Louis XVI's reign was marked by various challenges and crises, which ultimately led to the downfall of the monarchy. During his reign, France faced financial difficulties due to extravagant spending by previous kings and involvement in costly wars, such as the American Revolution.

4. **Financial Crisis:** Louis XVI attempted to implement reforms to alleviate the financial crisis, but his efforts were met with resistance from the nobles and clergy who held significant power and privilege. Despite his intentions, his inability to effectively address the economic problems contributed to a growing dissatisfaction among the French population.

5. **French Revolution and Execution:** The French Revolution began in 1789 with the storming of the Bastille and the adoption of the Declaration of the Rights of Man and of the Citizen. Louis XVI and his queen, Marie Antoinette, were eventually arrested and put on trial for treason. Louis XVI was found guilty and was executed by guillotine on January 21, 1793.

6. **Conclusion:** Louis XVI was throned in 1774 and his reign lasted until the outbreak of the French Revolution in 1789. The French Revolution led to the end of the monarchy and the subsequent execution of Louis XVI.