Tom,
The Heruli, Vandals and Goths were Germanic tribes. What about the Albigenses, the Waldenses, and the Lollards (mentioned by brakelite)?
How do we define 'heresy'? Heresy is that which is contrary to 'the truth once delivered to the saints' (Jude 1:3 ESV). In Harold O. J. Brown's magisterial work,
Heresies: The Image of Christ in the Mirror of Heresy and Orthodoxy from the Apostles to the Present (Doubleday 1984), he defined heresy as follows:
The Albigenses were heretics, based on their doctrine of God, when compared with Scripture. See
HERE.
The Waldenses were a lay group of travelling preachers in the Roman Catholic church who were persecuted severely by the RCC. They were precursors of the Reformation. See '
Who are the Waldensians?' When compared with Scripture, their teachings were not those of heretics.
As for the Lollards, being followers of John Wycliffe, they also were precursors of the Reformation. See '
The foundations: John Wycliffe'. Scripture declares them as orthodox and not heretics.
Oz