Sáncte Míchael Archángele, defénde nos in proélio, cóntra nequítiam et insídias diáboli ésto præsídium. Ímperet ílli Déus, súpplices deprecámur: tuque, prínceps milítiæ cæléstis, Sátanam aliósque spíritus malígnos, qui ad perditiónem animárum pervagántur in múndo, divína virtúte, in inférnum detrúde. Ámen.
The photos you provided of the Prince and the queen do NOT show them in the uniforms of the Knights of Malta. Not sure what uniforms those are, but they are CERTAINLY NOT the uniform of the Knights of Malta. Not all funny outfits are from the same group.
Quite the opposite. It's a prayer to the Archangel who expelled satan from heaven.
Do your research before you make stupid comments.
Only someone influenced by Satan would object to a prayer asking for the Archangel who kicked satan out of heaven and into hell.
Repent and believe in the Gospel!