Who introduced the cyrillic alphabet?

The Cyrillic alphabet was created by Saint Cyril, a Byzantine missionary and scholar, and his brother Saint Methodius in the 9th century.

While they are credited with the creation, it's important to note that:

* They didn't invent the alphabet from scratch. They adapted the Greek alphabet to write the Slavic languages, incorporating elements from the Glagolitic alphabet (another early Slavic script).

* The alphabet wasn't called Cyrillic during their lifetime. It was later named after Saint Cyril.

The Cyrillic alphabet was initially used for religious purposes in the First Bulgarian Empire and later spread to other Slavic countries, becoming the standard writing system for many of them.