Final answer:
Lydia from Thyatira was a seller of purple cloth, indicating her wealth and high social standing. She is noted in the New Testament as the first European convert to Christianity.
Step-by-step explanation:
The individual from Thyatira who was known as a seller of purple cloth is Lydia. Lydia is mentioned in the Christian New Testament in the book of Acts. She is recognized as the first recorded European convert to Christianity and is celebrated for her hospitality to Apostle Paul and his companions.
Purple cloth was a luxury item in ancient times, often associated with royalty and high status due to the difficulty and expense of producing the purple dye. Lydia's profession as a seller of purple cloth indicates she was a person of some wealth and standing in Thyatira, a city noted for its dyeing industry.