These were some of Sylvia Day's earlier works. While they are standalone historicals, they are loosely connected by the Reece family. If you read the modern Blacklist series (#3 above), you do not need to read these originals, as the plots were modernized for the new books.
If you want vampires, angels, and forbidden love, this is Sylvia Day’s hidden gem. Sadly, this series was never finished, but the two existing books are beloved by paranormal fans. sylvia day book series