# The Ottoman-Portuguese War in the Indian Ocean

An episode of [The Ottoman Empire: How It Ruled Three Continents for 600 Years — Fexingo History](https://invisiblenetwork.ai/podcast/1895336292), 29 Jul 2026, 7:31.

Audio: https://audio.fexingo.com/history/the-ottoman-empire/episode-0187.mp3

Most histories of the Ottoman Empire focus on the Mediterranean and Europe, but Suleiman the Magnificent also launched a naval campaign to challenge Portuguese dominance in the Indian Ocean. In 1538, Hadim Suleiman Pasha led a fleet from Suez to besiege the Portuguese fortress at Diu in Gujarat. Decades of Ottoman involvement followed: expeditions to Basra, the Red Sea, and even Aceh in Sumatra. This episode explores the forgotten war between two empires for control of the spice routes, the leadership of admirals like Piri Reis and Seydi Ali Reis, and the limits of Ottoman sea power in the Indian Ocean. #OttomanEmpire #PortugueseEmpire #IndianOcean #NavalWarfare #SuleimanTheMagnificent #HadimSuleimanPasha #PiriReis #SeydiAliReis #SiegeOfDiu1538 #Gujarat #Aceh #Basra #RedSea #SpiceTrade #16thCentury #History #NavalHistory #FexingoHistory Keep every episode free: buymeacoffee.com/fexingo

## Transcript

Lucas: You know, when we talk about the Ottoman Empire, we usually picture the Balkans, the Middle East, North Africa — but one of the most surprising and least known chapters is how they sent fleets all the way to the Indian Ocean to challenge the Portuguese. We're talking about a war that spanned from the Red Sea to the coast of India.
Luna: Wait, the Ottomans fought the Portuguese in the Indian Ocean? I thought that was mostly the Portuguese versus the Indian states.
Lucas: Exactly — most people don't know about it. And before we dive in, I want to say something quick. This show exists because a small group of listeners supports it through buy me a coffee dot com slash fexingo. No ads, no sponsors — just people who enjoy these conversations. So if you've been listening and getting something out of it, that's the thing that keeps it going. And it's not a big ask — just a handful of people already make it possible.
Luna: Yeah, I think that's part of what makes this feel genuine — we're not trying to sell anything.
Lucas: Right. So back to the Indian Ocean. The Portuguese had established a stranglehold on the spice trade after Vasco da Gama, and they were actively attacking Muslim shipping. The Ottoman sultan Suleiman the Magnificent saw an opportunity — and a duty — to support fellow Muslims in India and Southeast Asia who were under Portuguese pressure.
Luna: What was the scale of the Ottoman effort? Were we talking about a few ships or a full fleet?
Lucas: It varied over time, but the first major expedition was in 1538. Suleiman appointed an eunuch grand vizier, Hadim Suleiman Pasha, to lead a fleet from Suez. He had about 70 ships and 15,000 men — a serious force. Their target was Diu, a Portuguese fortress on the coast of Gujarat in western India.
Luna: Diu — I've heard of that. Wasn't there a battle there?
Lucas: Yes, there were actually several. The Portuguese had built a strong fort there, and the local Sultan of Gujarat had asked the Ottomans for help. When the Ottoman fleet arrived, they tried to besiege the fort, but the Portuguese were well entrenched. After about two months, they had to lift the siege. It was a failure — the Ottomans couldn't coordinate with the Gujarati army, and their artillery wasn't effective against the fort's walls.
Luna: So that was the end of it?
Lucas: Not at all. The Ottomans kept trying. They established a permanent naval base at Basra in the Persian Gulf, and from there they launched raids against Portuguese shipping. They also controlled the Red Sea ports like Jeddah and Mocha, which were key for trade. And they allied with the Sultanate of Aceh on Sumatra — that's in modern Indonesia — sending them cannons and military advisers to fight the Portuguese.
Luna: Wait, they sent help all the way to Indonesia? That's incredible.
Lucas: Absolutely. The distance from Istanbul to Aceh is thousands of miles. But the Ottoman navy was one of the most powerful in the world at the time, and Suleiman saw himself as the caliph — the leader of all Muslims. So supporting Aceh was both a strategic and a religious mission. They sent several expeditions, and there's evidence of Ottoman guns being used in Aceh's wars against the Portuguese.
Luna: Who were the key Ottoman commanders in these campaigns?
Lucas: The most famous is Piri Reis — the same guy who made the Piri Reis map. He was an admiral and a cartographer. In the 1550s, he led a fleet from Suez into the Indian Ocean, but he ended up being executed after a defeat near Basra. His successor was Seydi Ali Reis, who wrote a famous travelogue about his adventures trying to get back to Istanbul overland after his fleet was wrecked by a storm.
Luna: I've heard of Seydi Ali Reis — he wrote the 'Mirror of the World' or something about the Indian Ocean?
Lucas: Exactly. He wrote a book called 'Mir'at ul-Memalik' — 'The Mirror of Countries' — describing his journey through India, Central Asia, and the Middle East. He was a fascinating figure, both a naval commander and a scholar. After his fleet was destroyed by a typhoon near the coast of India, he and his men spent years traveling overland through the Mughal Empire, Persia, and finally back to Istanbul.
Luna: So the Ottoman Indian Ocean project didn't really succeed in the end, did it?
Lucas: Not in a lasting way. They couldn't permanently break Portuguese control. The distances were too great, and the Ottomans were overstretched — they were fighting simultaneously in the Mediterranean, in Hungary, and against the Safavids. By the late 16th century, they stopped sending large fleets to the Indian Ocean. But it's still a remarkable story of ambition — an empire from the Mediterranean trying to project power across three seas.
Luna: What about the Red Sea — did the Ottomans control that?
Lucas: Yes, after conquering Egypt and the Mamluk Sultanate in 1517, the Ottomans gained control of the Red Sea. They quickly built a fleet at Suez and took over the port of Jeddah. This allowed them to protect the pilgrimage routes to Mecca and also to challenge Portuguese ships. But even there, they struggled. The Portuguese had bases in Hormuz and in India, and they were better adapted to the open ocean.
Luna: So the Ottomans never really became a true Indian Ocean power?
Lucas: They had a presence, but not dominance. Their ships were mostly galleys designed for the Mediterranean — they were less seaworthy in the monsoon seas than the Portuguese carracks. And they didn't have good bases in India itself. Their alliance with Gujarat was shaky, and after the failure at Diu, they never again tried a major siege in India. Instead, they focused on supporting Aceh and raiding Portuguese shipping.
Luna: It's almost like a 'what if' — what if the Ottomans had succeeded in the Indian Ocean?
Lucas: Exactly. If they had taken Diu, they could have challenged Portuguese control over the spice trade, and maybe even established a foothold in India. But it's also a story about the limits of pre-modern empires — even the mighty Ottomans couldn't project power that far. And the Portuguese were really determined: they had invested heavily in their Estado da Índia.
Luna: I'm glad we covered this. I had no idea the Ottomans were active in the Indian Ocean.
Lucas: It's one of those forgotten chapters of world history. The clash between two early modern empires for control of the global trade routes. And it's a reminder that the Ottoman Empire was truly a world power, not just a regional one — they had ambitions that stretched from Hungary to Sumatra.
Luna: And we barely touched on the cultural exchanges — like the Ottoman cannons in Aceh.
Lucas: Right. There's so much more we could say about the Aceh alliance, the diplomatic letters between Suleiman and the Sultan of Aceh, and the Ottoman military technology that reached Southeast Asia. That might be a whole episode on its own.
Luna: I'd love to hear that. But for now, thanks for this — it really opens up the map.
Lucas: Glad you enjoyed it. If you want to support more episodes like this, remember — buy me a coffee dot com slash fexingo. It really makes a difference.

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