The group was discovered by Hermann von Soden and designated by him with the symbol K1.
[3] The leading members of the group, according to Soden, are manuscripts S, V, and Ω.
According to Soden the group K1 is the oldest form of the Kappa–text, dating from the 4th century and resulting from Lucian's recension.
The text of Mark 16:8-20 has not numbered by κεφαλαια (chapters) at the margin and their τιτλοι (titles) at the top.
[5] The group probably evolved from Family E. It represents the earliest stage of the Kappa-text.