doomsman

As an aside: the original meaning of "doom" was "law or judgment" and a judge in those Anglo-Saxon days was called a doomsman.

B-U-S-H Spells D-O-O-M The Daily Growler 2006

Then she bowed her head, and the sword of the doomsman fell.

A Child's Book of Saints William Canton 1909

At the place of execution, Dorothea begged the doomsman to tarry a little, and kneeling by the block, she raised her hands to heaven and prayed earnestly.

A Child's Book of Saints William Canton 1909

"Then shalt thou die," said Sapricius; and he bade the doomsman take her to the place of execution and strike off her head.

A Child's Book of Saints William Canton 1909

Ivan acts merely as the instinctive doomsman of Nature or of God, and the old village Pope, who, as the veil of life grows thin, is feeling after the law above human law, justifies the wielder of the axe, which has been no instrument of vengeance but simply an exponent of the wholesome vitality of earth.

Robert Browning Dowden, Edward 1904

Here the poet's imagination is as intense in its presentation of Christ the doomsman:

Robert Browning Dowden, Edward 1904

Under no circumstances could the poor wretch tell the tale or identify either the prisoners or their doomsman.

Ben-Hur, a tale of the Christ 1901

Then receiveth he penance for every sin [as] enjoined by his doomsman [124] that is grounded in Holy Church by the teaching of the Holy Ghost.

Revelations of Divine Love 1901

Perpetua watched him as calmly as a martyr of old days watched the advance of the doomsman.

The Proud Prince 1898

Guinevere, when she meets her lover, rescuer, and doomsman, is no longer a girl, and Lancelot is almost a boy.

A History of the French Novel, Vol. 1 From the Beginning to 1800 George Saintsbury 1889