ɚɹˈɪdʒɪnəli lˈeɪd dˌaʊn æz ɐ tˈuːdˈɛkɚ stˈiːm ʃˈɪp ʌvðə lˈaɪn ʌvðə bˈʊlwɔːɹk klˈæs, kˌælɪdˈoʊniə wʌz kənvˈɜːɾᵻd ɔnðə bˈɪldɪŋ stˈɑːks ˌɪntʊ ɐn ˈɑːɹmɚd fɹˈɪɡət.
Originally laid down as a two-decker steam ship of the line of the Bulwark class, Caledonia was converted on the building stocks into an armoured frigate.