The first government in history to issue paper money, the Song(宋) dynasty was the ruling dynasty in China between 960 and 1279. A culturally rich period for the arts, philosophy, and social life, the dynasty also bolstered(を揺るぎないものにする)naval strength and developed revolutionary new military technology - augmented(権力を増大させる)by the use of gunpowder(火薬)- to repel(追い払う)invaders. Nevertheless, the Song dynasty was conquered in 1279 by the Mongol ruler Kublai Khan.