Backstory to Galatians 

Galatia was a region in what is now modern day Turkey
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Paul visited the region of Galatia on his first missionary journey (c. 46-48 AD). He started churches in Psidian Antioch, Iconium, Lystra, and Derbe. You can read about this in Acts 13-14.  

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Temple ruins, Antioch of Psidia.