[An Irish-Canadian co-production,
Vikings was developed and produced
by Octagon Films and Take 5 Productions.
Michael Hirst, Morgan O'Sullivan, John Weber,
Sherry Marsh, Alan Gasmer, James Flynn
and Sheila Hockin are credited as
executive producers.
The first season's budget was of US$40 million.]
Yes it has been on Amazon and other channels
but New for Ch5HD
Only the first 3 episodes
so far.
https://en.wikipedia.org/wiki/Vikings_(TV_series)