Harald “Blåtand” Gormsson was a King of Denmark and Norway who lived during the 10th century AD. He was responsible for the unification of Denmark.
Following this feat, Harald set his sights beyond the borders of his own kingdom, and conquered Norway. Whilst the majority of his subjects were followers of paganism, Harald was favorably inclined towards Christianity.
He did what he could to promote this foreign faith within his kingdom. Today, Harald Blåtand (‘Bluetooth’) is a household name thanks to the wireless technology standard named after him.
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Source: Bluetooth: Why Modern Tech is Named After Powerful King of Denmark and Norway | Ancient Origins