Gaelic
Gaelic is an adjective that means "pertaining to the Gaels". As a noun, it may refer to the group of languages spoken by the Gaels, or to any one of the languages individually. In particular, the different Celtic languages spoken in both Ireland and Scotland are very often referred to just as "Gaelic", which can cause confusion.
History
History (from Greek ἱστορία, historia, meaning "inquiry, knowledge acquired by investigation") is the study of the past as it is described in written documents. Events occurring before written record are considered prehistory. It is an umbrella term that relates to past events as well as the memory, discovery, collection, organization, presentation, and interpretation of information about these events. Scholars who write about history are called historians.