Henceforth their functions were equivalent to those of the "permanent synod" and the syncelli at Constantinople.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 3: Brownson-Clairvaux] Reference

In the course of time the patriarchs took two or more syncelli, the most distinguished of whom was called protosyncellus (protosygkellos).    From Wordnik.com.  [The Catholic Encyclopedia, Volume 14: Simony-Tournon] Reference

Unless subsequent endowments authorized otherwise, the regular number was to be 525, viz., 80 priests, 150 deacons, 40 deaconesses, 70 subdeacons, 160 lectors, 25 cantors, besides 75 doorkeepers, 2 syncelli, 12 chancellors, and 40 notaries.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 6: Fathers of the Church-Gregory XI] Reference