Short answers, pulled from the story.
Lancelot de Carle wrote the poem Epistre Contenant le Procès Criminel Faict à l'Encontre de la Royne Anne Boullant d'Angleterre. He served as secretary to Antoine de Castelnau, the French ambassador to England, and recorded the trial of Anne Boleyn on the 2nd of May 1536.
The court heard allegations of incest, adultery, and treason against Anne Boleyn on the 2nd of May 1536. She was accused of having sexual relations with five men, including her own brother George Boleyn, and conspiring to kill the king.
Anne Boleyn was executed in the Tower of London on the 19th of May 1536. Her head was severed by a skilled swordsman brought from France to ensure a quick and clean death.
The poem remained unpublished until 1545 because Lancelot de Carle feared the political repercussions of publishing a document that criticized the Tudor regime. He kept the work in manuscript form to avoid immediate danger while it circulated among those with access to the French ambassador's papers.
Mark Smeaton, Henry Norris, Sir Francis Weston, and William Brereton were executed alongside Anne Boleyn. George Boleyn, Viscount Rochford, Anne's own brother, was also executed for incest with his sister.