Sir Lancelot 20d

[billy bear]

Can anyone help with this answer please. I've got p-c-a-i.

[kayakamina]

Peccavi

[billy bear]

I am most grateful. Thankyou.

[Mikejas]

I've always liked the little story that goes with this. When Napier, a military man, had overcome the province of SIND in the Indian subcontinent he sent a one-word telegram back to the UK. It read PECCAVI. The translation for this Latin word is "I have sinned"