Sunday of the 7th Ecumenical Council

Reading from the Synaxarion:

On the Sunday that falls on or immediately after the eleventh of
this month, we chant the Service to the 350 holy Fathers of the
Seventh Ecumenical Council, which gathered in Nicaea in 787 under the
holy Patriarch Tarasius and during the reign of the Empress Irene and
her son, Constantine Porphyrogenitus, to refute the Iconoclast
heresy, which had received imperial support beginning with the Edict
issued in 726 by Emperor Leo the Isaurian. Many of the holy Fathers who
condemned Iconoclasm at this holy Council later died as Confessors and
Martyrs for the holy Icons during the second assult of Iconoclasm in the
ninth century, especially during the reigns of Leo the Armenian and
Theophilus.

Resurrectional Apolytikion in the Fourth Tone
When the women Disciples of the Lord had learned from the Angel the
joyful message of the Resurrection and had rejected the ancestral
decision, they cried aloud to the Apostles triumphantly: Death has been
despoiled, Christ God has risen, granting His great mercy to the world.

Resurrectional Kontakion in the Fourth Tone
Savior and Deliverer is He who raised up from the tomb and from the
bonds those born on earth, for He is God; and He destroyed Hades' bars
and gates, and on the third day arose, as the Master of all.

Seasonal Kontakion in the Plagal of the Second Tone
O Protection of Christians that cannot be put to shame, mediation
unto the creator most constant: O despise not the voices of those who
have sinned; but be quick, O good one, to come unto our aid, who in
faith cry unto thee: Hasten to intercession and speed thou to make
supplication, O thou who dost ever protect, O Theotokos, them that honor thee.