Which preposition to use with regia

as Occurrences 1%

For, though in the substance of gold one satisfies himself with colour and weight, yet another thinks solubility in aqua regia as necessary to be joined with that colour in his idea of gold, as any one does its fusibility; solubility in aqua regia being a quality as constantly joined with its colour and weight as fusibility or any other; others put into it ductility or fixedness, &c., as they have been taught by tradition or experience.

for Occurrences 1%

He had not been to Australia after all, but had exchanged his berth on board the Victoria Regia for another in a ship bound for New York.

in Occurrences 1%

The Victoria Regia in the Calcutta Botanic Garden has from some cause or other not flourished so well as it was expected to do.

Which preposition to use with  regia