The City of Ottawa has won its appeal in a long-running battle with the owner of the former sports dome at Lansdowne Park.

The Ontario Superior Court ruled that an earlier arbitrator's decision to award Coliseum Inc. more than $2 million was "unreasonable" and contained "a number of errors in law."

The fight began with council's decision to redevelop Lansdowne Park, when the city and the company couldn't agree on where to relocate the sports dome. The original contract for Lansdowne Park was good until May 2015, but city lawyers argued the agreement also allowed for early termination.

Coliseum Inc. rejected a move to Ledbury Park and complained that the University of Ottawa's new sports field on Lees Avenue wasn't ready. The company claimed $6.5 million in damages, sending the matter to arbitration.

In February, an arbitrator awarded Coliseum Inc. $2.24 million, but today's ruling reverses that decision and awards the city legal costs.

In the meantime, the University of Ottawa got its own dome and Coliseum set up its dome at the RA Centre.