Recently, I'm researching the references about the Lord's Day in ancient christian writings, and had some doubts about the greek expression.
In Revelation 1:10, the day is called kuriakn nmera, in other word's, Lord's day, employing the word kuriakos, wich is defined by Strong as an adjective.
http://cf.blueletterbible.org/lang/lexi ... ersion=kjv
In Didache, chapter 14, the author uses the expression kuriakn de kuriou, that would be "Lord's Lord's". ...