sentences:  This rationale could make the titular Grand Duke of Saxony, Michael, Prince of Saxe-Weimar-Eisenach, the royal heir by primogeniture after extinction of the Albertine branch (which is the most junior line of the House of Wettin although it alone attained the rank of a kingdom within Germany).One or more of the Ernestine Wettins may also have claims superior to descendants of both female and de-morganatized Albertine dynasts if an "Erbverbrüderung" had been signed between the Albertine and any of the Ernestine branches of the dynasty.There are a number of extant lines of the House of Wettin (Weimar, Meiningen and Coburg; and the most junior of them, Coburg, includes the sub-branches of Windsor, Coburg proper, Koháry, Bulgaria and Belgium) who ruled the various Ernestine duchies and other realms.