Krønberg started off as the corporation Krønberg Technologies.  The R&D department came up with "must have" improvements in FTL propulsion (one either had these improvements, or one took twice to three times as long to get anywhere).  The results turned Herr Krønberg's company into a multi-planet corporation.  Suddenly he was dealing with tax and import laws that were driving him crazy, and keeping far too many lawyers employed.  He stumbled upon the idea of declaring the company to be an independent nation, crowned himself Monarch and declared his daughter, Blanche, to be Princess and Heir Apparent.  He got away with this by threatening to recall the lease on all Krønberg Technology engines.  You see, he didn't sell the engines, but leased them out.  By leasing an engine from KT, you get an instant (or nearly so) replacement when one wears out or develops problems.  Suddenly, the governments of several powerful planets, including Earth and Kentaurus, were faced with the aspect of having feckless space fleets.  KT technicians could turn off any engine remotely.  Admirals and presidents were left with the choice of recognizing the nation status of Krønberg, or having starships that were stuck with slower-than-light speeds.  Quite the bloodless coup.

At Herr Krønberg's death, Blanche became Queen and eventually gave birth to Princess Sofia.  Blanche had quite a head for diversifying Krønberg's resources, and secured lend-lease options and 51% First Refusal Rights on resource rich moons and planets in dozens of systems.  She had quite a knack for moving in just as some other company was about to go bankrupt and buying up their resources.  

I can tell you as an authority on the subject that there's no truth to the rumor that Krønberg actually owns a star.  (Just the energy output rights of one.  Queen Blanch made good use of her Court Lawyers.)

Princess Sofia ascended to the throne and monarchdom.  She majored in jurisprudence in college and received a Ph.D. in the History, specializing in the Age of Reason.  She was a remarkable social engineer and developed Krønberg's long overdue Constitution, replacing the obsolete Articles of Incorporation.  

Queen Sofia gave birth to Mariah, the current Princess.

Sophia was a beloved and inspired Matriarch, but a lousy mother.  Mariah grew up spoiled and accustomed to having far more money than she could ever spend.  On Queen Sofia's death, Princess Mariah decided that she didn't want to ascend to the throne and assume the responsibilities of a nation.  That's when I was hired, but that's another story.  It was a matter of being in the wrong place at the wrong time.