1856 | Oz is born. As he doesn't consider his early years formative to his development, he will not regal you with descriptions of his childhood personality or antics. His siblings join him in 1858 (Endymion), 1862 (Porphyria), 1863 (Don Juan), 1865 (Christabel), 1867 (Shalott), and 1869 (Lycoris).
1868 | Ozymandias goes to Hogwarts, where he meets and quickly bonds with a housemate named Dash. They are the sort of Ravenclaws who get into trouble, much to the consternation of their more studious peers.
1870 | Endymion joins Oz at Hogwarts. Ozymandias picks up some electives, and if they're ever important I'll figure out what they were.
1873 | Porphyria starts Hogwarts when Ozy starts sixth year, with a lighter but still fairly serious NEWT level course load.
1874 | Don Juan begins Hogwarts during Oz's final year. He finishes up his courses and gets reasonably high grades, not that he ever intends to use them.
1875 - 1877 | Being young and rich, Ozymandias takes off to the continent for an extended tour with his best friend Dash. He occasionally returns for family events but is largely absent while Christabel goes off to her first year of Hogwarts (fall of 1876) and Endymion graduates (spring of 1877), and by the time he returns there's this new place called Hogsmeade where once there was only a train station, a boat dock, and an inn.
1878 | Shalott goes to Hogwarts. Meanwhile, Oz and Dash have established lifestyles at home as similar as possible to the ones they lead abroad, which includes a lot of revelry and seducing women. For the next few years, Oz keeps a room at the club (Atlantis) and mostly lives there to avoid scandalizing his family (although he's sure his parents and siblings are aware of the sort of things he gets up to).
1879 | Because one can't debauch all the time, Ozymandias decides to become an inventor. His early efforts are met with fantastic failures, due not to a lack of skill on his part but rather from overblown expectations of what he (and wizardkind, and magic in general) is capable of.
1880 | Porphyria graduates and tries to skip her own debut, which is cute.
1881 | Don Juan graduates. The ‘Endymion, The Veela and The Hammock’ incident occurs. Ozymandias is a little jealous, having never had the opportunity to sleep with a veela, and shows this by making fun of Endymion endlessly for the next two years.
1882 | Phyri publishes her first complete collection of poems. Oz is also a little jealous of that, because he hasn't managed to do anything particularly noteworthy yet. He takes this as the impetus to give up his room at the club and move back home more permanently so that he can have a dedicated work space for his inventions.
1883 | Christabel graduates. Dash has a kid with his mistress which seems like a combination of poor planning and awful luck to Oz. Although he would never say as much to Dash, Ozymandias personally thinks his plans to marry his mistress are a little ridiculous and definitely something he'll regret once the impulse wears off, so he's secretly relieved when Dashwood Sr. stops that plan in its tracks.
1884 | The season in Hogsmeade is punctuated by plague and fire. Oz is safe from both, but it does put a damper on his party plans. The relatively quiet social season actually isn't the worst. He wonders for the first time if maybe he's starting to outgrow this sort of thing. Phyri’s second anthology of poems is released.
1885 | Shalott graduates and is off to finishing school. Oz, being of an age where men generally consider marriage, starts to consider it, but in a very unhurried way. Dash certainly isn't in a hurry, and it seems a shame to leave him all alone in bachelorhood (ish) after they've been inseparable so long.
1886 | Ozymandias meets Thomasina Pomfrey, an eccentric female healer who annoys him, then irritates him, then... actually sort of excites him, in a weird, passive-aggressive way. They have several verbal sparring matches, some of which are very public and others of which are very loud, so they get a bit of a reputation within their respective social circles.
1887 | To the surprise of literally everyone, Oz decides to propose to Miss Pomfrey. He tells Dash that for all her innumerable faults she is at least interesting, and if he must marry he would prefer to marry someone interesting. To the surprise of everyone except Oz (who had himself never doubted how much of a catch he was), she accepts. They are engaged for several months, during which time they appear no more willing to tolerate each other than previously, and are then married. During this, Dash has another child with his mistress. Within their social circle they're generally considered equally scandalous for a few months, as most of his friends assume Ozymandias is marrying Miss Pomfrey after having accidentally knocked her up and/or gotten caught in the throes of passion. When Thomasina fails to become visibly pregnant at any point in the months following their marriage and Dash continues playing family with his mistress, the scales of respectability tip much more heavily in Oz's favor (though it's not as though Oz cares if Dash is mired in scandal).
1888 | Married life suits him, and suits him even better when people eventually stop making teasing comments about their future children (by now, most people assume they sleep separately — they certainly don't, but he doesn't mind that people think so).
1890 | Phyri is cursed and turned into a wren. Oz jokingly confuses her for her pet raven several times.
1892 | Ozymandias continues living his best life: haphazardly inventing things in his spare time, spite-flirting with his wife, and occasionally painting the town red with Dash. The latter does start to lose some of its appeal, but Oz is hesitant to completely abandon his lifestyle with his best friend — which is perhaps a contributing factor towards his establishing a regular tryst with ballerina Sophia Voss. While hardly his first extramarital affair, she is the first relationship serious enough that one could actually call her a "mistress" (though Oz does not).
1893 | Midway through the year, Minister Justin Ross announces his resignation which spurs a Ministerial election. While bullshitting with friends at the club Oz boasts that he could probably campaign just as well or better than any of the current candidates — and throws his hat in the ring to prove it. While the campaign begins with Oz just going through the motions, it picks up momentum and he eventually secures several key endorsements (including one from Minister Ross), which contribute to his winning the election by an exceptionally narrow margin in October. This is quite a shock, as he had not actually intended to become Minister.
1894 | Upon taking office Oz sets his sights on the primary issue of his campaign: voting reform. He establishes a committee and sees a bill through the Wizengamot during his first year in office. Outside of work, he is also very busy: his mistress, Sophia Voss, announces that she is pregnant — which wouldn't be an insurmountable difficulty, except that she wants to keep the baby. Oz categorically refuses and they argue. He tries to get her back to the negotiating table afterwards, but is agitated and too sloppy — Thomasina discovers the affair. While she doesnt' learn of the potential bastard, he is told in no uncertain terms he is never to touch Sophia again. He makes a deal with her to buy her shares of the ballet and act in her financial and creative interests in exchange for her leaving the country prior to the birth of the baby... a deal which he holds up his end of, but she doesn't. The baby is due in June, and in July he hears word she has married an English professor. He tries to connect with her to find out the status of the child, but she refuses to talk to him... and then in October of 1894, she dies.