From A Wiki of Ice and Fire
Year 52 After the Conquest (52 AC) is a year in the Westerosi calendar, the 52nd after Aegon's crowning in Oldtown that maesters and educated people use as a reference to date the years.
In 52 AC King Jaehaerys reprised his progress, visiting the Vale of Arryn. Although Queen Alysanne could only accompany him during part of the travel, her influence was instrumental in the promulgation of the Widow's Laws. The king also centered his efforts into the urbanization of King's Landling, starting the construction of a great central square and several long streets.
- King Jaehaerys visits Gulltown, Runestone, Redfort, Longbow Hall, Heart's Home, the Gates of the Moon and the Eyrie
- Boremund Baratheon, son of Rogar Baratheon and Alyssa Velaryon