The Code of Romulus is a children's novella by Caroline Lawrence, published in 2007 to celebrate the 10th anniversary of World Book Day.

It is a re-publication of the short story Bread and Circuses that appeared in the anthology The Mammoth Book of Roman Whodunits published in 2003.

The story takes place in Ostia in November 79 AD, between the events of the fifth and sixth books (The Dolphins of Laurentum and The Twelve Tasks of Flavia Gemina.)

They make friends with the baker's younger son, Porcius, who shows them around the bakery and introduces them to his family and the slaves who work there.

Flavia and Nubia attend a secret pre-dawn gathering of Christians and unmask the well-meaning thief, but promise not to tell on condition the stealing stops.