Definition of "allegiant"

For your great graces / Heap'd upon me, poor undeserver, I / Can nothing render but allegiant thanks, / My prayers to heaven for you, my loyalty, / Which ever has and ever shall be growing, / Till death, that winter, kill it.

1613 (date written), William Shakespeare, [John Fletcher], “The Famous History of the Life of King Henry the Eight”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act III, scene ii]

In another group, still allegiant to the gangsters, were men such as Shorty, Sorensen, Lars Jacobsen, and Larry.

1914, Jack London, chapter L, in The Mutiny of the Elsinore

The fully allegiant group accepted the ultimate sovereignty of the British government.

1979, Paul Bew, Peter Gibbon, Henry Patterson, The State in Northern Ireland, 1921-72: Political Forces and Social Classes, page 84