Boyd’s Bible Dictionary:
(Lydus land). Woman convert of Thyatira (Acts 16:14).
Concise Bible Dictionary:
A disciple of Thyatira—a place noted for its dyes—a seller of purple, residing at Philippi, whose heart the Lord opened, and who became, as far as is known, the first convert in Europe. She received Paul, Silas, and Luke into her house (Acts 16:14,40).
Jackson’s Dictionary of Scripture Proper Names:
to firebrand: travailing