ADVERBS Something; sometimes; still; than; thenThan is used for then:
Then for than, freq. in North's Plutarch, Ascham, &c. In O. E. the commonest forms are "thanne" = then; "then" = than. Then and than (like tum and tam, quum and quam in Latin) are closely connected, and, indeed, mere varieties of the same word. They were originally inflections of the demonstrative, and meant "at that (time)," "in that (way)." As "that" is used as a relative, "than" has the signification of "in the way in which" (quam), just as then (71) is used for "at the time at which" (quum). It is usual to explain "He is taller than I" thus: "He is taller; then I am tall." This explanation does not so well explain "He is not taller than I." On the whole, it is more in analogy with the German als, Latin quam, Greek ἤ, to explain it thus: "In the way in which I am tall he is taller." The close connection between "in that way," "at that time," "in that place," &c., is illustrated by the use of there for thereupon, or then.
“And their ranks began
To break upon the galled shore and than
“Even there resolved my reason into tears.