On the Contributions of St. Athanasius at the First Council of Nicea?

In 325, the bishops gathered at Nicea (with Athansius present not as a bishop but as a deacon-secretary to the Bishop of Alexandria) for an ecumenical council---in which the Council declared that the Son had no beginning, but had an ``eternal derivation'' from the Father, and therefore was co-eternal with Him and equal to God in all aspects. Did St. Athanasius actually speak at the Council of Nicea; if so, is there a record of what he said? Or, perhaps, was his earlier treatise ``On the Incarnation'' invoked during the Council's proceedings? In a nutshell---What was the extent of St. Athanasius' contributions personally *at the Council* and which affected the outcome(s) of the First Council of Nicea?