paleographic
adjective
pa·leo·graph·ic ˌpā-lē-ə-ˈgra-fik 
variants or paleographical
ˌpā-lē-ə-ˈgra-fi-kəl
: relating to writings of former times
paleographically
ˌpā-lē-ə-ˈgra-fi-k(ə-)lē
adverb 
Word History
Etymology
paleo- + -graphic, after paleography
First Known Use
1833, in the meaning defined above