In 1048 he documents as Gaugraf in the Pustertal and Count in the Lavanttal, Siegfried must therefore have already succeeded to his father-in-law Engelbert IV as heir to this territory by then.
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In 1074 a monastery was built, on the authority of Siegfried I, Archbishop of Mainz, over the grave of the hermit Heimerad (d. 1019), who had had a little chapel and hermitage here.
He was closely related to Siegfried I, Count of Sponheim, patriarch of the Carinthian Sponheimish branch, but the exact relationship between the two dynasts is disputed.
Donald C. Jackman considers Stephan I a son of Siegfried I. Both Jackman and Josef Heinzelmann consider Stephan as being identical to Stephan, Vogt of Worms documented with his brother Markward in 1068.