What is Ernest Augustus I, Duke of Saxe-Weimar-Eisenach?
{{Infobox royalty | name = Ernest Augustus I | image = Ernst August I., Herzog von Sachsen-Weimar-Eisenach.jpg | image_size = | caption = | succession = [[Duke of Saxe-Weimar]] | reign = 1707–1748 | predecessor = [[Wilhelm Ernst, Duke of Saxe-Weimar|Wilhelm Ernst]] with [[Johann Ernst III, Duke of Saxe-Weimar|John Ernst III]] | successor = [[Ernest Augustus II, Duke of Saxe-Weimar-Eisenach|Ernest Augustus II]] | regent = [[Wilhelm Ernst, Duke of Saxe-Weimar|Wilhelm Ernst]] | reg-type = Co-ruler | succession1 = [[Duke of Saxe-Eisenach]] | reign1 = 1741&ndash;1748 | predecessor1 = [[Wilhelm Heinrich, Duke of Saxe-Eisenach|Wilhelm Heinrich]] | successor1 = [[Ernest Augustus II, Duke of Saxe-Weimar-Eisenach|Ernest Augustus II]] | spouse = [[Eleonore Wilhelmine of Anhalt-Köthen]] <br/> [[Margravine Sophie Charlotte of Brandenburg-Bayreuth|Sophie Charlotte of Brandenburg-Bayreuth]] | issue = Wilhelm Ernst, Hereditary Prince of Saxe-Weimar<br/>Princess Wilhelmine Auguste <br/>Johann Wilhelm, Hereditary Prince of Saxe-Weimar <br/>Princess Charlotte Agnes Leopoldina <br/>Princess Johanna Eleonore Henriette <br/>[[Ernestine Albertine of Saxe-Weimar|Ernestine Albertine, Countess of Lippe-Alverdissen]]<br/>[[Bernardina Christina Sophia of Saxe-Weimar-Eisenach|Bernhardina, Princess of Schwarzburg-Rudolstadt]]<br/>Prince Emmanuel Frederick <br/>Karl August Eugen, Hereditary Prince of Saxe-Weimar <br/>[[Ernest Augustus II, Duke of Saxe-Weimar-Eisenach]] <br/>Princess Eleonore Christiane <br/>Princess Johanna Auguste <br/>[[Princess Ernestine of Saxe-Weimar|Ernestine, Duchess of Saxe-Hildburghausen]]<br/>Prince Ernst Adolf | house = [[Saxe-Weimar-Eisenach|House of Saxe-Weimar-Eisenach]] | father = [[Johann Ernst III, Duke of Saxe-Weimar]] | mother = [[Princess Sophie Auguste of Anhalt-Zerbst|Sophie Auguste of Anhalt-Zerbst]] | birth_date = {{Birth date|1688|4|19|df=y}} | birth_place = [[Weimar]] | death_date ={{Death date and age|1748|1|1