The 19th Century Post Diaspora lasted from 1 January of the year 1801 PD to 31 December 1900 PD. By Old Earth time reckoning, it was the 40th Century CE.
|King Michael II of Manticore dies; Samantha II rises to the throne.|
|The first usable nuclear gravitically directed energy weapon (NGDEW) is invented.|
|Raoul Courvosier is born.|
|The Maslow System Technical Conservation Act of 1815 PD is legislated.|
|Iris Babcock is born on Gryphon.|
|Josef Byng is born.|
|The Courageous-class light cruiser HMS Fearless is commissioned.
Hamish Alexander is born on Manticore.
|The first Triumphant-class battleship is commissioned by the People's Navy.|
|The Manticoran Bureau of Weapons learns of the laser head weapons concept.|
|The heavy cruiser HMS War Maiden is commissioned.|
|The Greenbriar-Chanticleer War is fought.
The Solarian survey vessel Tempest is unable to plot a return course after a wormhole transit, and has to travel home 113 days through hyperspace to make its way home.
|Roland Shelton enlists in the Royal Manticoran Navy.|
|Bernard Yanakov is born on Grayson.|
|The People's Republic of Haven begin their policy of violent conquest.The new Protector's Palace is built in Austin City on Grayson.|
|Alistair McKeon is born.|
|Queen Samantha II of Manticore dies of old age. Her son, Roger III, rises to the throne.|
|Honor Harrington is born on the planet Sphinx.|
|Jared Mayhew is born on Grayson.|
|The April Massacre occurs on Haven.|
|Emily Alexander is paralyzed in an aircar accident.|
|Iris Babcock enlists in the Royal Manticoran Marine Corps.
Grayson starts to build its first orbital stations.
|The Havenite Sword class is first proposed as a replacement design for the old Champion class heavy cruiser.|
|After the discovery of the local wormhole terminus, the Basilisk System is annexed by the Star Kingdom of Manticore.
Horace Harkness enlists in the Royal Manticoran Navy.
Crown Princess Elizabeth is born on Manticore.
|Astral Energetics, Ltd produces the first complete laser-head-armed impeller-drive anti-ship missile system.|
|Basilisk Act of Annexation|
|PNS Sword, the lead ship of the eponymous class of heavy cruisers, is commissioned into the People's Navy.|
|Tomas Ramirez is born on the planet San Martin.
Grayson and Masada started to vastly improve their technological levels, and the First Grayson-Masadan War is fought.
|Manticore introduces the Mk-19 capital ship missile.|
|Benjamin Mayhew IX is born on Grayson.
Honor Harrington starts hang-gliding in the Copperwalls.
|King Roger III makes a state visit to San Martin.
The first Charles Wade Pope-class light cruiser is commissioned by the People's Navy.
The Andermani Empire buys the laser head missile technology from Astral Energetics, Ltd.
|Matthew Simonds enters Masadan politics.
GNS Austin Grayson is commissioned, and the Grayson Space Navy reinvents the inertial compensator.
Raoul Courvosier is in combat for the last time until the Battle of Blackbird.
|Honor Harrington enters the Royal Manticoran Naval Academy.|
|Prescott Tremaine is born.|
|Honor Harrington graduates from the Academy.
BuWeaps begins working on the Mk-13 anti-ship missile.
|Jennifer O'Brien is born on Manticore.|
|Honor Harrington is promoted to Lieutenant and assigned to HMS Osprey as sailing master.|
|Honor Harrington assumes command of an intrasystem LAC.
Michael Mayhew is born on Grayson.
|The Havenite Invasion of San Martin takes place; Tomas Ramirez and most of his family escape to Manticore.|
|King Roger III is assassinated in the Indigo Salt Flats. Elizabeth III rises to the throne, tracks down her father's killers, but has to cover up the whole plot for political reasons.Masada starts to invest one third of its gross system product in the Navy for the planned conquest of Grayson.|
|PNS Bastogne, the first Bastogne-class destroyer, is commissioned.|
|The Havenite Bureau of Mental Hygiene is transferred from the Ministry of Public Health to the Secretary of Public Information.|
|PNS Desforge, the first Desforge-class destroyer, is commissioned.|
|The Ouragan-class pinnace first enters service with the People's Navy.|
|The Trevor's Star System is annexed by the People's Republic of Haven.|
|Honor Harrington enters the Commanding Officer's Course.|
|Crown Prince Michael graduates from Saganami Island and begins his Midshipman cruise aboard HMS Intransigent, en route to Masada.|
|Sally MacBride enlists in the Royal Manticoran Navy.
Pavel Young is promoted to Captain.
|Michael Reynaud becomes the assistant chief controller at Basilisk Traffic Control.|
|Honor Harrington assumes command of HMS Hawkwing and receives the White Command Beret.
Estelle Matsuko becomes the Resident Commissioner for Planetary Affairs on Medusa.
|The Manticoran Parliament amends Paragraph 10, Subsection 3 of the Commercial Regulations.|
|PNS Conquistador spoils a secessionist plot in the Morell System.|
|Michael Reynaud becomes the chief controller at Basilisk Traffic Control.
Alistair McKeon is assigned to HMS Fearless as tactical officer.
Benjamin Mayhew IX becomes the new Protector of Grayson.
|Alistair McKeon is promoted to executive officer of Fearless. HMS Warlock was assigned to Basilisk Station.|
|HMS Hawkwing, commanded by Harrington, participates in taking Casimir Station from Manpower Incorporated, and liberating the slaves there.|
- Likely PNS Triumphant.
- The date is somewhat questionable, see Talk:Casimir System.
18th Century PD
19th Century PD
20th Century PD