Which church allowed icons?

In my research on the history of iconography, I've come across various denominations and sects with differing views on the use of icons in worship. Could you elaborate on which specific church or religious tradition traditionally allowed the use of icons in their liturgies and practices? Was this a widespread phenomenon among various denominations, or was it specific to a particular church or geographic region? Additionally, how did the allowance of icons impact the spiritual experience and devotion of believers? Understanding this nuance could greatly enhance my knowledge on the topic.