More early evidence - and can I quickly make this point. We don't have to attest Gnosticm to the first century to make the case, because a real life Jesus cannot be attested to then either.
Anyway, on to ...
Polycarp (ca. 69 – ca. 155) was a mentor of Iranaeus, and he preached mainly in Asia, in Smyrna. Gnosticism was huge among the Jews in the East – Tertulian bemoaned the fact that “Marcion’s followers filled the whole universe.”
OK, just a quick diversion to Marcion.
http://en.wikipedia.org/wiki/Marcion
Marcion is sometimes referred to as one of the gnostics, but from what assessment of his lost writings can be gleaned from his mainstream opponents, his teachings were quite different in nature.[2] His canon included ten Pauline Epistles and one gospel[3] called the Gospel of Marcion, a rejection of the whole Hebrew Bible, and did not include the rest of the books later incorporated into the canonical New Testament. He propounded a Christianity free from Jewish doctrines with Paul as the reliable source of authentic doctrine. Paul was, according to Marcion, the only apostle who had rightly understood the new message of salvation as delivered by Christ.
So I would say that if Marcion understood Paul’s deeper message, he must have been some sort of Gnostic. The theology of Marcionism would also qualify Marcion as a Gnostic:
http://en.wikipedia.org/wiki/Gospel_of_Marcion
Church Fathers wrote and the majority of modern scholars agree that Marcion edited Luke to fit his own theology, Marcionism. This view is consistent with the way he altered other books in his canon. It is also likely because Luke's gospel was believed to be complete by Marcion's time. In it, he eliminated the first two chapters concerning the nativity and beginning at Capernaum and made modifications of the remainder suitable to Marcionism. The differences in the texts below highlight the gnostic view that, first, Jesus did not follow the Prophets and, second, the earth is evil.
Anyway, to get back to the Literalist Polycarp, he was the scourge of the ‘heretics’ as Jerome says in his Illustrious Men 17:
http://www.earlychristianwritings.com/polycarp.html
Polycarp disciple of the apostle John and by him ordained bishop of Smyrna was chief of all Asia, where he saw and had as teachers some of the apostles and of those who had seen the Lord. He, on account of certain questions concerning the day of the Passover, went to Rome in the time of the emperor Antoninus Pius while Anicetus ruled the church in that city.
There he led back to the faith many of the believers who had been deceived through the persuasion of Marcion and Valentinus, and when. Marcion met him by chance and said "Do you know us" he replied, "I know the firstborn of the devil." Afterwards during the reign of Marcus Antoninus and Lucius Aurelius Commodus in the fourth persecution after Nero, in the presence of the proconsul holding court at Smyrna and all the people crying out against him in the Amphitheater, he was burned. He wrote a very valuable Epistle to the Philippians which is read to the present day in the meetings in Asia.
And here is the relevant extract from that epistle:
Polycarp 7:1
For every one who shall not confess that Jesus Christ is come in
the flesh, is antichrist: and whosoever shall not confess the
testimony of the Cross, is of the devil; and whosoever shall pervert
the oracles of the Lord to his own lusts and say that there is
neither resurrection nor judgment, that man is the firstborn of
Satan.
Polycarp 7:2
Wherefore let us forsake the vain doing of the many and their false
teachings, and turn unto the word which was delivered unto us from
the beginning, being sober unto prayer and constant in fastings,
entreating the all-seeing God with supplications that He bring us
not into temptation, according as the Lord said, The Spirit is
indeed willing, but the flesh is weak. [/quote]
So whether or not we accept that Marcion was Gnostic (which I don’t doubt), the Valentinians certainly were – and Polycarp was preaching against them in the late first/early second century.