[tannhaeuser]

Let's get the dates straight:

Enterprise Service Bus was coined by Progress/Sonic Software for their middleware product around 2002

Service Oriented Architecture as a term to describe an enterprise architecture around web services was only used after SOAP became a thing in 1999

[andyhedges]

Yes, but the concept existed in 'process servers' 'EAI hubs' and various other names. EBS caught on as the defacto term later.