Tolkien wrote The Silmarillion which is a total and complete history of Middle Earth encompassing every single historical event, person, war, geography, languages and mythology that exists in his books.
Even before we get to the Silmarillion, the appendices of Return of the King are actually already meaty af. (They're also the only place where Helm's canonically-nameless daughter was mentioned in the first place.) And those appendices already blow every lore book Martin's written for ASOIAF put together out of the water, much less these current-year hacks' mangling '''''additions''''' to Middle-earth.
Tolkien wrote The Silmarillion which is a total and complete history of Middle Earth encompassing every single historical event, person, war, geography, languages and mythology that exists in his books.
Even before we get to the Silmarillion, the appendices of Return of the King are actually already meaty af. (They're also the only place where Helm's canonically-nameless daughter was mentioned in the first place.) And those appendices already blow every lore book Martin's written for ASOIAF put together out of the water, much less these current-year hacks' mangling '''''additions''''' to Middle-earth.