Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Gaulish
uassos
→
Norman
vassa
(derived)
→
Portuguese
vassalo
(derived)
→
Old Portuguese
vasalo
(derived(roa-opt/gl))
→
Old Portuguese
vassalo
(derived)