Definition of "vext"

What happiness to reign a lonely king,Vext — O ye stars that shudder over me,O earth that soundest hollow under me,Vext with waste dreams?

1859, Alfred, Lord Tennyson, “The Coming of Arthur”, in Idylls of the King

And that same night, the night of the new year,By reason of the bitterness and griefThat vext his mother, all before his timeWas Arthur born [...]

1859, Alfred, Lord Tennyson, “The Coming of Arthur”, in Idylls of the King

[...] and thenceTaking my war-horse from the holy man,Glad that no phantom vext me more, return'dTo whence I came, the gate of Arthur's wars.

1859, Alfred, Lord Tennyson, “Holy Grail”, in Idylls of the King