Which battle or war decided the current UK royal family bloodline?

In the past battles or wars were had and the new king or queen was decided. There must have been a last battle or war that decided the bloodline that

In the past battles or wars were had and the new king or queen was decided. There must have been a last battle or war that decided the bloodline that runs through the veins of the current royal family. Which one was it?

or:In the past battles or wars were had and the new king or queen was decided. There must have been a last battle or war that decided the bloodline that runs through the veins of the current royal family. Which one was it?

or:There is a lot of history involved. Here is an interesting study on that subject: www.thetrumpet.com/literature/44/the-united-states-and-britain-in-prophecy

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