[1] Some legends connect the church with legendary King Cadwallo (now usually referred to as Cadwallon ap Cadfan, father of Cadwaladr.

Previously the sign stated that it was the West Saxon king Caedwalla but this was contradicted by Bede's writings that he was buried in Rome.

[4] In "The Roaring Girl, or Moll Cutpurse" by Dekker and Middleton, Sebastian says "The clock at Ludgate, sir, it ne'er goes true".

On the 17th century font there is a Greek palindrome – ΝΙΨΟΝ ΑΝΟΜΗΜΑΤΑ ΜΗ ΜΟΝΑΝ ΟΨΙΝ Nipson anomemata me monan opsin (Wash the sins, not only the face).

The north windows are by Powell of Whitefriars, representing the Abbot and Chapter of Westminster, the Bishop of London, and the Dean of St Pauls.

[7][8] The current design is topped by a lead-covered octagonal cupola supporting a balcony and tapered spire rising to a height of 158 ft (48 m).

As a curiosity, this is from the burial register: "“1615, February 28, St. Martin’s, Ludgate, was buried an anatomy from the College of Physicians.” (It was first noticed by Andrew Lang, in an article in "Books and Bookmen").

In 1893 to 1894, the church underwent a major rebuilding and alteration, with the floor level raised, and many bodies disinterred from the churchyard and reburied at Brookwood Cemetery.

[13] The contemporary carvings in the church are also attributed to three joiners, Athew, Draper and Poulden, and to the carvers Cooper and William Newman.