=St. John’s Gate=, Clerkenwell, is the sole remaining portion of the priory of St. John of Jerusalem, the seat in this country of the Knights Hospitallers, instituted by Godfrey de Boulogne. The Gate now forms the headquarters of the St. John’s Ambulance Association. =Temple Bar= was not one of the City fortifications, but the ordinary gateway of the Temple. It was popularly known as =The City Golgotha=, owing to the spiked heads of traitors exposed thereon--_Golgotha_ being Hebrew for “the place of skulls.” The Bar was taken down in 1878. =London Bridge=--that is to say, the original structure--was the first bridge over the Thames. The present structure was thrown open August 1, 1831. =Billingsgate= traces its origin to Belin, one of the early kings of Britain, who built a gate on the site of the present market and gave it his name. =St. Katherine’s Docks= received their title from an ancient hospital dedicated to St. Katherine, swept away by their construction in the year 1828. =The Mint= is so called in accordance with the Anglo-Saxon _mynet_, coin [_see_ MONEY]. The =Trinity House=, the seat of the Trinity Corporation, which controls the pilotage of the Thames and the various lighthouses, buoys, harbour-dues, &c., around our coast, owed its foundation to Sir Thomas Spert, Comptroller of the Navy of Henry VIII., and commander of the _Harry Grace de Dieu_, originally situated at Deptford; it was incorporated in 1529 under the style of “The Master-Wardens and Assistants of the Guild, or Fraternity, or Brotherhood, of the most glorious and undivisible Trinity, and St. Clement, in the parish of Deptford, Stroud, in the County of Kent.” The present edifice was built in 1795. =Crosby Hall=, Bishopsgate, at one time a palace, but now converted into a restaurant, was built by Sir John Crosby about the middle of the fifteenth century. The =Congregational Memorial Hall=, Farringdon Road, which occupies part of the site of the old Fleet Prison, was built in 1872 to memorate the ejection of more than two thousand Church of England ministers from their charges, August 24, 1662, consequent upon their refusal to subscribe to the “Act of Uniformity” [_see_ NONCONFORMISTS]. The =Guildhall= is the hall of the City guilds; the word GUILD being derived from the Anglo-Saxon _gildan_, to pay, alluding to the fee paid for membership. =Doctors’ Commons=, originally established as a college for the Professors of Canon and Civil Law, received its name from the rule which required the Doctors to dine at a common table. That sombre-looking structure, the =College of Arms=, otherwise =Heralds’ College=, is the office where the records of the genealogical descent of all our noble families are preserved, and where searches for coats-of-arms may be instituted. The Corporation of the College dates back to the year 1484. The General Post Office is officially denominated =St. Martin’s-le-Grand= because it occupies the site of a collegiate church and sanctuary of that name founded by Within, King of Kent in 750, and chartered by William the Conqueror in 1068.