The "King of Württemberg" refers to the monarchs who ruled the Kingdom of Württemberg, a state in southwestern Germany. The kingdom was established in 1806 and lasted until 1918, when the monarchy was abolished following World War I. The most notable king was Friedrich I, who reigned from 1806 to 1816 and played a significant role in modernizing the state. Württemberg was known for its rich cultural heritage and contributions to the arts and sciences. The royal family, particularly the House of Württemberg, was influential in shaping the region's history and development. The kingdom's capital was Stuttgart, which remains an important city in Germany today.