There’s a unique family backstory behind the holy book that the President-elect will use for his second inauguration on Monday.

The president-elect eschewed the star-spangled “Trump Bible” in favor of volumes with personal and national history.

When President-elect Donald Trump takes the oath of office again on Jan. 20, he’ll do so with one hand on a bible.

Some presidents did not use a Bible to take the oath of office, including Theodore Roosevelt, who did not use anything when he was sworn into office in 1901, and John Quincy Adams, who chose a legal book for his 1825 swearing-in, to signify his responsibility to uphold the U.S. constitutional law.