“Dân•i•eil′ 7.7-8 (discussed in more detail later) suggests that Bishop Narcissus is the “other קֶרֶן.” But the prophecy stipulates (Dân•i•eil′ 7.25) that this “other קֶרֶן” would change the times and the laws. Is there evidence of this?
Yes. There is. Bishop Narcissus presided over the Council of Caesarea in 196 C.E., at which it was established that the festival of the goddess of E*sotera (E*aster) would be celebrated on sun-g*od-day instead of on Passover, thus changing from Passover to E*aster; changing the time. This was the first celebration of E*aster by Christians. It is likely that the change from Shab•ât′ to sun-g*od-day was also part of this package.

Christianity wasn’t established in the Roman Empire until Constantine the Great made the newly evolved religion the official religion of the Roman Empire, giving birth to the “Holy Roman Empire,” in 325 C.E. But it was a little more than a century earlier, in the Council of Caesarea in 196 C.E., that this “קֶרֶן זְעֵירָה” first formalized a perversion of Nәtzâr•im′ Tor•âh′ -teachings and the fearsome, terrorizing and severe fourth חֵיוָה—Hellenist Christianity—began to formalize as a mәshum•âd′ ⇒to⇒gentile,Hellenist-pagan religion.
It was “allowed into the hand” of this 11th Christian Church ruler, Bishop Narcissus, “to change the times and the law, which would [then] stand for a specified duration of time: an i•dân′ and עִדָנִין and a fraction of an i•dân′ .” Thus, it is not only the 11th gentile Bishop, Narcissus, but the “חֵיוָה” of Hellenist gentile Christianity he inaugurated, into whose hand it was given to dominate until the end of the period that Christians have long called the “Time of the Gentiles.””

[Quote from the 1993 Covenant. (This book can be found in http://www.netzarim.co.il)]