Which country among the following was not a part of the Third Coalition against Napoleon?

The Third Coalition (1805) was a major European alliance formed to counter the expansionist policies of Napoleon I's French Empire. The primary members of this coalition included the United Kingdom, the Russian Empire, the Austrian Empire, and Sweden. While Prussia eventually engaged in diplomatic maneuvers and military preparations through the Treaty of Potsdam, it famously maintained a neutral 'wait-and-see' approach during the critical phases of the 1805 campaign. This neutrality kept Prussia out of the anti-French alliance during the decisive Battle of Austerlitz, where Napoleon defeated the combined Russo-Austrian forces. Prussia did not fully commit to war against Napoleon until the formation of the Fourth Coalition in 1806. Therefore, while Russia and Sweden were active members of the Third Coalition, Prussia was not a formal participant in the 1805 conflict, and France was the target of the coalition, not a member.

Sources

1. [1] https://www.britannica.com/event/Battle-of-Austerlitz