Bastien was born in 1700s Venice to 3rd generation Indian immigrants to France. He grew up not poor but hardly a prince, spending much of his childhood performing tricks in the streets of Paris with travelling circus troupes to make money. In his teens he earned a scholarship to a college of the arts in Venice and stayed there for the rest of his life.
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At 22 he began the 'Lost and Found Refuge', a bohemian shelter for young artists and creatives. The deal was simple - room and board and support in return for 50% of artistic profits and a mention of Bastien's name. Within three years he was one of the most important men in the countries art scene. Dealing his students work and making his own was rewarding and profitable; before long Bastien was rubbing elbows (and other things) with the elite nobles.
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Ten years passed before he knew it. His work had begun to get stale, his paintings dull, when his entire life changed. He went to sleep in Venice and woke up being spat out into the Hollowed Grounds. Such a change was difficult to adjust to, having no idea where he was or why he was there, but Bastien was pleased to see that this place had alcohol to help him adjust to the idea.
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The Rathskeller was familiar enough he could almost forget he wasn't home, at least sometimes. Getting work there as a bartender, he now spends his time trying to charm the patrons in order to forget the aching homesickness and confusion in his gut.

Bastien made friends with Rexanna, Remi, Ronin. He worked briefly as a bartender at the Rathskeller, where he had a...experience with Edrei, in Where Everybody Knows Your Name.
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Bastien met Safrin and began a church dedicated to her ([PQ] Dionysus Reborn) involved in plenty of hedonism and orgies and drinking. However, eventually he ran foul of Safrin and was cursed by her to be an old man in Lost Potential.

Bastien decided he had had enough of being cursed and took up The Voice on an offer to ascend in [God Quest] Delivery. He showed Rexanna his fangs and to his great delight (because he has a crush on her) was allowed to bite her in Ascended to Greatness. He then began the 'Artist's Sanctuary', an artist's guild, in [PQ] The Artist's Sanctuary.

In The Next Ten Minutes, Bastien asked Rexanna to be his girlfriend, and she said yes. He then found her unconscious at the Spire in you are a fairytale and took her to Phoebe's clinic for healing. Having learnt that Lucas had left her that way, he confronted him in Don't Pin it All On Me (though other than dick-waggling, not much came of this). He participated in the Longheat seasonal event.

Refusing to join Queen Zariah's new army, Bastien found himself in jail in The Count of Monte Caido. Rexanna made a deal to get him out ( love bites so deep) and he began to ask her if she would consider ascending. She did so with him in [God Quest] i hope you don't run away. Then, in follow your fire , he asked her to marry him, and she said yes.

Bastien married Rexanna in [Mini Event] I'll love you just as long as time allows. He painted a mural and welcomed some new members to the Artist's Sanctuary in [PQ] Light Up The Night. During Longnight, in [KQ] Long Lost Souls, he was attacked in the leg by Longnight monsters and had to head back to the Temple without Rexanna. While Loren healed his leg in My Leg!, he still suffers with weakness in that side.

Before Longnight, Rexanna and Bastien's child Azrael was given to them by the Voice in you're invited.
During Longnight, Rexanna died from touching the magical door Deimos had made in [Mini Event] the worst is just around the bend. Bastien, now alone with Azrael, went into a depression and was angry at Deimos in All the times we never had, but came to his senses soon after. Rexanna was burned and her ashes scattered at the fields they had their first date in Things we lost in the fire, with Deimos, Kiada and Hotaru attending.

Still reeling from Rexanna's death, Bastien stayed alone in his Artist's Sanctuary for a while. In Lost Souls he learnt from the Voice that Rexanna's spirit was safe with her, meaning he could see her again after his own death, which lifted his spirits somewhat. In [PQ+] cannot stare at our wounds forever, he aided Deimos in an exploration mission into the elemental storms.

Wessex stepped down from the position of Queen of the Hollowed Grounds and Bastien took it up with Isla, becoming the 'Overseers'. Not long after this, he visit the shrine in the Atheneum and had a vision from the Core (Thread: i believe her, i believe her telling him to 'get to the court'.