This week I've been sparing a thought for Kate Middleton, the Duke of Norfolk, and her impending birthdom
In addition, there is a past participle downfall used adjectivally in I will lift the downfall Mortimer (1H4 1.3.133, where Q has down-trod) and our downfall birthdom
(Mac 4.3.4), sometimes represented as downfallen in modern editions.
Bestride our downfaln birthdom
-- (35) Johnson was so sure of this emendation that, unusually, he quotes the passage in the Dictionary to illustrate the meaning of ~birthdom' as ~privilege of birth'.