Any individual capable of paying his own passage received the full credit upon arrival, whereas those incapable of paying their passage could draw upon MCT for a dollar amount equal to their credit to cover the difference between their own resources and the cost of passage. In addition, an immigrant whose resources were greater than the cost of his passage could invest the surplus, paying 50% of the "book" price for additional land and/or investment. The most affluent immigrants thus became "Second Shareholders," with estates (whether in terms of land or industrial wealth) which, in some cases, rivaled those of the original shareholders and entitled them to patents of nobility junior to those of the existing aristocracy. Those immigrants who were able to retain their base land right or perhaps enlarge upon it slightly became "yeomen," free landholders with voting rights beginning one Manticoran year (1.73 Terran Standard Years) after their arrival. Those who completely exhausted their credit to buy passage to Manticore were known as "zero-balance" immigrants and did not become full citizens until such time as they had become well-enough established to pay taxes for five consecutive Manticoran years (8.7 Terran Standard Years). While all Manticoran subjects are equal in the eyes of the law, whether enfranchised to vote or not, there were distinct social differences between shareholders, yeomen, and zero-balancers, and even today there is greater prestige in claiming a yeoman as a first ancestor than in claiming a zero-balance ancestor. And, of course, direct descent from a full shareholder is the most prestigious of all.

The constitutional system prospered over the next five hundred years, blessed by a series of strong monarchs and a steadily growing population base. The constitution contains a strong "Declaration of Fundamental Rights," but the franchise is limited to citizens who have paid taxes for at least five consecutive years. (The policies encouraging emigration with credits were ended after a period of fifty years, having served their purpose most effectively, and it is no longer possible for an immigrant to become an instant shareholder or gain the franchise immediately upon arrival.)

The Constitution created a two-house Parliament, a Royal Council, and a Crown Judiciary. The Parliament consists of a House of Lords and a House of Commons with mutual veto power, and the Crown has the rights of both initiation and veto. According to some constitutional scholars (though not all, by any means), the Framers intended for the executive power to be exercised by the Royal Council, which, by law, consists of the Prime Minister, his subordinate executive ministers, and certain hereditary members, such as the Keeper of the Seal, the heir to the throne (as a nonvoting member), and the monarch. In fact, however, the Royal Council, now commonly referred to as the Cabinet, became the instrument through which the monarch acts as head of Government as well as head of State. Although the Prime Minister, who (traditionally) is from the House of Lords but must be able to command a majority in the Commons, manages the Cabinet, he may be dismissed by the King or Queen at will and acts in most ways as the monarch's executive officer. At the same time, it is only a foolish monarch who capriciously or willfully ignores the advice of his or her ministers and, especially, prime minister.

The Crown retains the power to pardon and commute, appoints ministers and judges with the advice and consent of the House of Lords, and, unless overruled by a majority in both houses, possesses the power to interpret constitutional law through its appointees to the King's (or Queen's) Bench. The Crown cannot, however, create new peers without the consent of a majority of the House of Commons.

In cases of disagreement between the Crown and both houses of Parliament, the Lords serve as the supreme judiciary without right of veto by Crown or Commons. The strongest safeguards of the common population lie in (1) the Commons' power to approve or disapprove budgets, (2) the Constitutional requirement that the Prime Minister command a majority in the Commons, and (3) the right to remove the monarch.

It is up to the Crown (actually, the Cabinet), and not the Commons, to initiate economic policy and propose budgets, and the Crown has an additional discretionary fund drawn from the extensive Crown lands and industrial holdings, but the Crown and Lords both know that they cannot long defy the Commons if the lower house decides to withhold budget approval. The fact that the Prime Minister, although serving at the Crown's pleasure, must also be able to poll a majority in the House of Commons (a similar majority in the House of Lords is not a constitutional requirement, although most PMs who cannot generally resign their office), also helps to insure that the viewpoint of the Star Kingdom's commoners will always be heard at the highest level. Finally, the Manticoran monarchy is one of the very few hereditary forms of government with a specific provision for the removal of a monarch for reasons other than incapacitation or criminal action. A monarch may be impeached for any reason, including but not limited to "high crimes and misdemeanors," by a two-thirds majority vote of the House of Commons. Impeachment proceedings may not begin in the House of Lords, and a three-quarters vote of both houses is required to actually remove a monarch. Although this constitutional provision has never been used and is now regarded by many constitutional authorities as a vestigial holdover from pre-monarchy days, it has never been removed, and the possibility of its exercise remains.

As a final safeguard intended to prevent the monarchy from losing touch with the non-aristocratic majority of the Star Kingdom's population, Roger I and Elizabeth I insisted that the Constitution include one additional provision. The heir to the throne is required by law to marry a commoner. Other members of the royal family may marry whomever they wish, but the Crown Prince or Crown Princess must marry outside the aristocracy.

The only real challenge to the Manticoran monarchy came in 1721 pd in the so-called "Gryphon Uprising," which remains the most internal excitement the Star Kingdom has been forced to confront. Gryphon, the least congenial of the three habitable planets of the Manticore System, has by far the smallest share of First Shareholder families, as its first outpost was not placed until fifteen years after the Plague. The bulk of its aristocracy came from the Second Shareholders, who, for the most part, had substantially less credit than First Shareholders and, accordingly, received smaller "Clear Grants" (that is, land to which clear title was granted prior to improvements by the owner/tenant). The Crown, however, had established the principle of "Crown Range" (land in the public domain and free for the use of any individual) to encourage emigration to Gryphon, and by 1715, the population of Gryphon had grown to the level set under the Crown Range Charter of 1490. At that point, as the charter required, the Crown began phasing out the Crown Range, granting title on the basis of improvements made, and the trouble began. Yeomen who hoped to become independent ranchers, farmers, or miners claimed that the planetary nobility was using strong-arm tactics to force them off the land — indeed, something very like a shooting war erupted between "squatters" and "the children of shareholders," and after two years of increasingly bloody unrest, a special commission was established with extraordinary police powers and a mandate to suppress the violence and reach a settlement.

The Gryphon Range Commission's final finding was that there was sound foundation to the yeomen's original complaints, and the Manticoran Army, having pacified and stabilized the situation, then oversaw a closely regulated privatization of the Crown Range. A degree of dislike between small landholders and certain of the noble families continues to this day, but it has become something of a tradition rather than a source of active hostility.