Monday after Trinity Sunday

Monday after Trinity Sunday marks the appointed day for King Arthur and Sir Mordred to meet in battle on a down near Salisbury, following their rival mustering of forces. Elsewhere, the same named day appears in the account of the Pentecost oath binding the Knights of the Round Table, linking the calendar to both chivalric obligation and the kingdom’s approaching collapse.

The Appointed Battle

After the fighting at Dover, King Arthur gathered his slain knights for burial and tended those who had been wounded. As supporters came to him, they reported that Sir Mordred was waging war unjustly. King Arthur then led his host westward along the coast toward Salisbury, where the two sides agreed to meet on a down near the sea on Monday after Trinity Sunday. The date therefore gives a precise temporal anchor to the confrontation, turning a general rebellion into a scheduled encounter.

The agreement did not mean that the realm had settled into two simple camps. Sir Mordred raised forces around London, drawing support from Kent, Southsex, Surrey, Estsex, Southfolk, and Northfolk. Many knights joined either King Arthur or Sir Mordred, while those who loved Sir Launcelot went over to Sir Mordred. The appointed Monday thus stands against a fractured political landscape: the approaching battle gathers a conflict already shaped by divided loyalties.

The Warning Before the Date

On the night before Trinity Sunday, King Arthur dreamed that he sat in royal finery on a chair fastened to a wheel. The wheel turned, and he fell into a deep black water filled with threatening creatures. After waking and falling again into a half-sleep, he saw Sir Gawaine arrive with ladies for whom Gawaine had fought. Gawaine warned that if King Arthur fought Sir Mordred the next day, both kings would die and most of their people on either side would perish.

The warning gives the calendrical marker a second force: Monday is not merely a date for action, but the moment when a foreseen catastrophe may be met or avoided. The dream places the promised battle within a pattern of reversal and loss, while Gawaine’s appearance connects the king’s impending fate to the dead and to the women Gawaine had defended. The passage establishes the warning before the scheduled meeting; it does not, in this evidence, state how King Arthur responds to it.

Pentecost Oaths and the Wider Calendar

The phrase also appears in the book’s account of the aftermath of King Arthur’s wedding and the establishment of the Knights of the Round Table. After several quests had been completed, King Arthur settled his knights, gave lands to those who lacked them, and imposed a code against outrage, murder, and treason. He required mercy toward those who sought it, succour for ladies and gentlewomen, and refusal to fight in wrongful causes for law or worldly gain. The knights swore to these obligations, and the oath was renewed each year at the high feast of Pentecost.

That annual observance makes the calendar more than a sequence of dates: Pentecost renews a collective standard by which the fellowship is meant to govern its conduct. Set beside the later Monday appointed for King Arthur and Sir Mordred, the oath’s recurring observance sharpens the contrast between the Round Table’s declared bonds and the realm’s eventual divisions. The date’s significance comes from this juxtaposition, not from evidence that the two scenes occur in the same year.

The Date in the Text’s Editorial History

In the editorial history of Le Morte Darthur, Monday after Trinity Sunday also appears as a date in Southey’s 1817 edition, where the editor’s supplied text includes the phrase in an account of King Arthur’s final conflict. The edition claimed to reprint Caxton’s first edition scrupulously, but its source copy lacked eleven leaves. The missing material had not yet been restored when the edition was prepared, and the replacement passages differ from Caxton’s text.

The editor’s investigation traced most of these passages to the first edition of Wynkyn de Worde, with some spelling and small-word changes; for the final chapters, a short portion came from another printed edition. For fifty years the interpolations passed among learned critics as genuine Caxton text. The date therefore belongs both to the story’s chronology and to its publication history: readers encountered it through an editorially mediated passage that was long mistaken for the original wording.