What important legal practice dates back to Henry the 2nd?

The important legal practice that dates back to Henry II is the establishment of the common law system in England. During his reign in the 12th century, Henry II implemented reforms that standardized legal procedures and created a system of royal courts, which allowed for a more consistent application of the law across the kingdom. This laid the foundation for the development of legal precedents, where past judicial decisions inform future cases. The common law system has since evolved but continues to influence legal practices in many countries today.