It isn t Both aren t even theories but products of simpleton invention without basis and are completely undoubtedly incorrect I favor none I delete d them both because AFAIK there are none sources at all on this issue The House of Saint Vladimir is of descent from a Travunian local noble house with doubtable links to the House of Trpimirovic and most surely no link to the House of Viseslavic However I must object putting it as a separate line Tvrtko asserted rule and his line Tvrtkovic is historically considered the main line of the Kotromanics As for the Trpimirovic branches I suggest following standard historical interpretation of the Svetoslavic being a cadet branch whereas the other being the simple continuation of the standard Trpimirovic line Kresimirovic