Why was the Russian Royal family executed on July 17, 1918?

On 17 July 1918, in the wake of the Russian Revolution of 1917, the last Russian royal family – the Romanovs – were brutally murdered by Bolshevik revolutionaries. Their deaths marked the end of a dynasty that had ruled Russia for more than 300 years.

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"the land of the dead"

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.