Prior to the beginning of world war i, which nation challenged great britain for supremacy of the seas?

Germany

Explanation:

Mostly meant to protect British trade as the root of their economic prosperity, the Royal Navy was recognized as the most potent in the world. However, since 1898 and up to WWI (1914), Kaiser Wilhelm II endeavored to build a german battle fleet to overcome Britain’s supremacy of the seas and therefore became the most important foreign threat to the British Empire.

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.